Review Chapter 10. 2) A parsec is slightly more than 200,000 AU. 2)

Size: px
Start display at page:

Download "Review Chapter 10. 2) A parsec is slightly more than 200,000 AU. 2)"

Transcription

1 Review Chapter 10 TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) A parsec is about 3.3 light-years. 1) 2) A parsec is slightly more than 200,000 AU. 2) 3) The nearest star system to our Sun, Alpha Centauri, is still over a parsec distant. 3) 4) If a star has a parallax of 0.25", then its distance is about 13 light-years. 4) 5) Two stars have the same absolute magnitude, but one lies twice as far from Earth as the other. It will appear half as bright. 5) 6) A +6.0 magnitude star is brighter than a +3.0 magnitude star. 6) 7) A 3rd magnitude star appears 2.5 times brighter than a 4th magnitude star. 7) 8) A type B star is bluer than a type G star. 8) 9) Hydrogen lines are strongest in class A stars. 9) 10) Only A type stars show hydrogen lines in their spectra. 10) 11) Molecular lines, such as TiO, are only found in very hot stars. 11) 12) White dwarfs lie on the lower left portion of the H-R diagram. 12) 13) Almost all stars on the main sequence range from 1 to 10 solar luminosities. 13) 14) Most naked-eye stars would fall to the top left on the H-R diagram. 14) 15) Main sequence stars lie at the top right corner of the H-R diagram. 15) 16) Our Sun lies about the middle of the main sequence and the H-R diagram. 16) 17) Main sequence stars are fusing hydrogen into helium in their cores. 17) 18) Most stars are single stars like our own. 18) 19) The mass of a newly formed star will determine its position on the main sequence. 19) 1

2 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 20) A star has a parallax of.05." Its distance is 20) A) 660 light-years. B) 66 parsecs. C) 200 parsecs. D) 5 light-years. E) 20 parsecs. 21) Which statement about stellar motion is incorrect? 21) A) Radial velocity is measured by the Doppler shifts of the spectral lines. B) The space velocity can be found from the radial and transverse velocities. C) You must also know the parallax to get the transverse velocity. D) The closer stars usually show larger proper motions. E) Proper motion is measured in intervals of six months. 22) The full Moon's apparent magnitude is 22) A) B) C) D) E) ) What physical property of a star does the spectral type measure? 23) A) composition B) temperature C) luminosity D) mass E) density 24) What can be said with certainty about a red star and a blue star? 24) A) The blue star has a greater proper motion than the red star. B) The red star is more massive than the blue star. C) The blue star is hotter than the red star. D) The red star is closer to Earth than the blue star. E) The red star has a greater radial velocity than the blue star. 25) The H-R diagram can plot 25) A) temperature versus luminosity. B) apparent magnitude versus spectral classes. C) radius versus mass. D) temperature versus mass. E) radius versus luminosity. 26) The stars with masses comparable to our Sun's, but sizes like the Earth are 26) A) red giants. B) white dwarfs. C) blue main sequence stars. D) red main sequence stars. E) neutron stars. 2

3 27) On the H-R diagram, the bright blue stars that dominate the naked-eye sky lie 27) A) in the middle of the main sequence. B) at the lower right. C) at the lower left. D) at the top left. E) at the top right. 28) On the H-R diagram, the Sun lies 28) A) at the top right. B) at the bottom right. C) at the top left. D) at the bottom left. E) about the middle of the main sequence. 29) On the H-R diagram, red supergiants like Betelgeuse lie 29) A) at the top right. B) at the bottom left. C) at the top left. D) at the bottom right. E) They can't be plotted, for they are not main sequence. 30) A star near the lower right of the H-R diagram is likely to be 30) A) blue, with high luminosity. B) yellow, with luminosity similar to our Sun's. C) red, with low luminosity. D) hot, bright, and very large. E) red, with high luminosity. 31) What information can be gained from the light curves of eclipsing binaries? 31) A) their masses B) their luminosities C) their sizes D) their temperatures E) their distances SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 32) To find the distance of nearby stars, we use their parallaxes obtained over -month intervals. 32) 33) If its parallax is 1", then the distance to the star is light-years. 33) 34) A stars total velocity is a combination of its and velocities. 34) 35) The absolute magnitude of the Sun is. 35) 36) The magnitude of a star depends on its luminosity and distance from us. 36) 37) From hottest to coolest, the seven letters for the star types are. 37) 3

4 38) The ionized helium lines show up only in class stars. 38) 39) In the M class stars, we find absorption lines not seen in hotter stars. 39) 40) Stars of the main sequence, like our own, are all converting into helium. 40) 41) The star's plays the major role in determining its main sequence position and luminosity. 41) 42) In general, the more massive the star, the its lifetime. 42) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 43) How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun? 44) Why can the Hubble Space Telescope give us better direct measurements of star diameters than larger Earth-based telescopes can? 45) What percentage of stars lie on the main sequence? Why? 46) Contrast main sequence stars of type B and G. 47) What is the relationship between a star's mass and its lifetime? 48) Why don't stars less massive then type M exist? 49) Explain the difference between radial and transverse velocities. 4

5 Answer Key Testname: REVIEW10 1) TRUE 2) TRUE 3) TRUE 4) TRUE 5) FALSE 6) FALSE 7) TRUE 8) TRUE 9) TRUE 10) FALSE 11) FALSE 12) TRUE 13) FALSE 14) TRUE 15) FALSE 16) TRUE 17) TRUE 18) FALSE 19) TRUE 20) E 21) E 22) B 23) B 24) C 25) A 26) B 27) D 28) E 29) A 30) C 31) C 32) six 33) ) radial; transverse 35) +5 or +4.8 to be more precise 36) apparent 37) OBAFGKM 38) O 39) molecular 40) hydrogen 41) mass 42) shorter. 43) It may be cooler, but it is about 1,000 times the Sun's diameter, and has a surface area almost a million times greater than the Sun. 44) Without the atmosphere and twinkling caused by turbulence, HST gives much better resolution and thus can directly image the disks of some of the giant stars, such as Betelgeuse. 45) About 90% of all stars are still fusing hydrogen to helium in their cores. 46) The B star will be hotter, larger, more massive and more luminous. 47) The more massive a star is, the faster it uses up its fuel and the shorter its lifetime. 5

6 Answer Key Testname: REVIEW10 48) A body less massive than a type M star (about 8% the Sun's mass) will not get hot enough by gravitational collapse to start fusing hydrogen into helium. 49) Radial velocity is found from Doppler shifts, and measures speed along our line of sight. Transverse velocity is motion across our line of sight, and requires both the apparent angular proper motion and knowledge of the parallax and distance. 6

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Homework Ch 7, 8, 9 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Our most detailed knowledge of Uranus and Neptune comes from 1) A) the

More information

Mass-Luminosity and Stellar Lifetimes WS

Mass-Luminosity and Stellar Lifetimes WS Name Mass-Luminosity and Stellar Lifetimes WS The graph shows the Mass-Luminosity Relationship for main sequence stars. Use it to answer questions 1-3. 1) A star with a mass of 0.5 solar masses would be

More information

Chapter 10 Measuring the Stars

Chapter 10 Measuring the Stars Chapter 10 Measuring the Stars Some of the topics included in this chapter Stellar parallax Distance to the stars Stellar motion Luminosity and apparent brightness of stars The magnitude scale Stellar

More information

Parallax: Measuring the distance to Stars

Parallax: Measuring the distance to Stars Measuring the Stars Parallax: Measuring the distance to Stars Use Earth s orbit as baseline Parallactic angle = 1/2 angular shift Distance from the Sun required for a star to have a parallactic angle of

More information

Chapter 15: Surveying the Stars

Chapter 15: Surveying the Stars Chapter 15 Lecture Chapter 15: Surveying the Stars Surveying the Stars 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures? How

More information

The Cosmic Perspective. Surveying the Properties of Stars. Surveying the Stars. How do we measure stellar luminosities?

The Cosmic Perspective. Surveying the Properties of Stars. Surveying the Stars. How do we measure stellar luminosities? Surveying the Stars Chapter 15 Lecture The Cosmic Perspective 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures? How do we

More information

Chapter 15 Surveying the Stars Pearson Education, Inc.

Chapter 15 Surveying the Stars Pearson Education, Inc. Chapter 15 Surveying the Stars 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures? How do we measure stellar masses? 1. How

More information

Position 1 Position 2 6 after position 1 Distance between positions 1 and 2 is the Bigger = bigger parallax (Ɵ)

Position 1 Position 2 6 after position 1 Distance between positions 1 and 2 is the Bigger = bigger parallax (Ɵ) STARS CHAPTER 10.1 the solar neighborhood The distances to the nearest stars can be measured using Parallax => the shift of an object relative to some distant background as the observer s point of view

More information

Astronomy 113. Dr. Joseph E. Pesce, Ph.D. Dr. Joseph E. Pesce, Ph.D.

Astronomy 113. Dr. Joseph E. Pesce, Ph.D. Dr. Joseph E. Pesce, Ph.D. Astronomy 113 Dr. Joseph E. Pesce, Ph.D. The Nature of Stars 8-2 Parallax For nearby stars - measure distances with parallax July 1 AU d p A A A January ³ d = 1/p (arcsec) [pc] ³ 1pc when p=1arcsec; 1pc=206,265AU=3

More information

Chapter 15 Surveying the Stars

Chapter 15 Surveying the Stars Chapter 15 Surveying the Stars 15.1 Properties of Stars Our goals for learning How do we measure stellar luminosities? How do we measure stellar temperatures? How do we measure stellar masses? How do we

More information

ASTR-1020: Astronomy II Course Lecture Notes Section III

ASTR-1020: Astronomy II Course Lecture Notes Section III ASTR-1020: Astronomy II Course Lecture Notes Section III Dr. Donald G. Luttermoser East Tennessee State University Edition 4.0 Abstract These class notes are designed for use of the instructor and students

More information

Chapter 15 Surveying the Stars Properties of Stars

Chapter 15 Surveying the Stars Properties of Stars Chapter 15 Surveying the Stars 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures? How do we measure stellar masses? Luminosity:

More information

Lecture Outlines. Chapter 17. Astronomy Today 8th Edition Chaisson/McMillan Pearson Education, Inc.

Lecture Outlines. Chapter 17. Astronomy Today 8th Edition Chaisson/McMillan Pearson Education, Inc. Lecture Outlines Chapter 17 Astronomy Today 8th Edition Chaisson/McMillan Chapter 17 Measuring the Stars Units of Chapter 17 17.1 The Solar Neighborhood 17.2 Luminosity and Apparent Brightness 17.3 Stellar

More information

Lecture 16 The Measuring the Stars 3/26/2018

Lecture 16 The Measuring the Stars 3/26/2018 Lecture 16 The Measuring the Stars 3/26/2018 Test 2 Results D C B A Questions that I thought were unfair: 13, 18, 25, 76, 77, 80 Curved from 85 to 79 Measuring stars How far away are they? How bright are

More information

Characterizing Stars

Characterizing Stars Characterizing Stars 1 Guiding Questions 1. How far away are the stars? 2. What evidence do astronomers have that the Sun is a typical star? 3. What is meant by a first-magnitude or second magnitude star?

More information

Chapter 8: The Family of Stars

Chapter 8: The Family of Stars Chapter 8: The Family of Stars We already know how to determine a star s surface temperature chemical composition motion Next, we will learn how we can determine its distance luminosity radius mass Measuring

More information

Characterizing Stars. Guiding Questions. Parallax. Careful measurements of the parallaxes of stars reveal their distances

Characterizing Stars. Guiding Questions. Parallax. Careful measurements of the parallaxes of stars reveal their distances Guiding Questions Characterizing Stars 1. How far away are the stars? 2. What evidence do astronomers have that the Sun is a typical star? 3. What is meant by a first-magnitude or second magnitude star?

More information

A star is at a distance of 1.3 parsecs, what is its parallax?

A star is at a distance of 1.3 parsecs, what is its parallax? Stars Spectral lines from stars Binaries and the masses of stars Classifying stars: HR diagram Luminosity, radius, and temperature Vogt-Russell theorem Main sequence Evolution on the HR diagram A star

More information

Measuring Radial & Tangential Velocity. Radial velocity measurement. Tangential velocity measurement. Measure the star s Doppler shift

Measuring Radial & Tangential Velocity. Radial velocity measurement. Tangential velocity measurement. Measure the star s Doppler shift 17. The Nature of the Stars Parallax reveals stellar distance Stellar distance reveals luminosity Luminosity reveals total energy production The stellar magnitude scale Surface temperature determines stellar

More information

15.1 Properties of Stars

15.1 Properties of Stars Surveying the Stars 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures? How do we measure stellar masses? How do we measure

More information

Review Questions for the new topics that will be on the Final Exam

Review Questions for the new topics that will be on the Final Exam Review Questions for the new topics that will be on the Final Exam Be sure to review the lecture-tutorials and the material we covered on the first three exams. How does speed differ from velocity? Give

More information

Pr P ope p rti t es s of o f St S a t rs

Pr P ope p rti t es s of o f St S a t rs Properties of Stars Distances Parallax ( Triangulation ): - observe object from two separate points - use orbit of the Earth (1 AU) - measure angular shift of object - angle depends on distance to object

More information

Measuring Radial & Tangential Velocity. Radial velocity measurement. Tangential velocity measurement. Measure the star s Doppler shift

Measuring Radial & Tangential Velocity. Radial velocity measurement. Tangential velocity measurement. Measure the star s Doppler shift 17. The Nature of the Stars Parallax reveals stellar distance Stellar distance reveals luminosity Luminosity reveals total energy production The stellar magnitude scale Surface temperature determines stellar

More information

Chapter 9: Measuring the Stars

Chapter 9: Measuring the Stars Chapter 9: Measuring the Stars About 10 11 (100,000,000,000) stars in a galaxy; also about 10 11 galaxies in the universe Stars have various major characteristics, the majority of which fall into several

More information

Chapter 8: The Family of Stars

Chapter 8: The Family of Stars Chapter 8: The Family of Stars Motivation We already know how to determine a star s surface temperature chemical composition surface density In this chapter, we will learn how we can determine its distance

More information

ASTR Look over Chapter 15. Good things to Know. Triangulation

ASTR Look over Chapter 15. Good things to Know. Triangulation ASTR 1020 Look over Chapter 15 Good things to Know Triangulation Parallax Parsecs Absolute Visual Magnitude Distance Modulus Luminosity Balmer Lines Spectral Classes Hertzsprung-Russell (HR) diagram Main

More information

a. Star A c. The two stars are the same distance b. Star B d. Not enough information

a. Star A c. The two stars are the same distance b. Star B d. Not enough information Name: Astro 102 S17 Test 1 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Your test is Version A. Please fill in the circle for A for this question on

More information

! p. 1. Observations. 1.1 Parameters

! p. 1. Observations. 1.1 Parameters 1 Observations 11 Parameters - Distance d : measured by triangulation (parallax method), or the amount that the star has dimmed (if it s the same type of star as the Sun ) - Brightness or flux f : energy

More information

27.1: Characteristics of Stars

27.1: Characteristics of Stars 27.1: Characteristics of Stars STAR NOTES: Part 1 What is a Star? A body of gases that gives off energy in the form of light and heat. 27.1: Characteristics of Stars Are all stars the same? No 1. Stars

More information

1 of 6 5/2/2015 6:12 PM

1 of 6 5/2/2015 6:12 PM 1 of 6 5/2/2015 6:12 PM 1. What is parallax? The distance to an object, measured in parsecs. The difference between the apparent and absolute magnitude. The apparent shift in POSITION of an object caused

More information

Astronomy Exam 3 - Sun and Stars

Astronomy Exam 3 - Sun and Stars Astronomy Exam 3 - Sun and Stars Study online at quizlet.com/_4zgp6 1. `what are the smallest group of stars in the H-R diagram 2. A star has a parallax of 0.05". what is the distance from the earth? white

More information

ASTRONOMY 1 EXAM 3 a Name

ASTRONOMY 1 EXAM 3 a Name ASTRONOMY 1 EXAM 3 a Name Identify Terms - Matching (20 @ 1 point each = 20 pts.) Multiple Choice (25 @ 2 points each = 50 pts.) Essays (choose 3 of 4 @ 10 points each = 30 pt 1.Luminosity D 8.White dwarf

More information

ASTRONOMY QUIZ NUMBER 11

ASTRONOMY QUIZ NUMBER 11 ASTRONOMY QUIZ NUMBER. Suppose you measure the parallax of a star and find 0. arsecond. The distance to this star is A) 0 light-years B) 0 parsecs C) 0. light-year D) 0. parsec 2. A star is moving toward

More information

Modern Astronomy Review #1

Modern Astronomy Review #1 Modern Astronomy Review #1 1. The red-shift of light from distant galaxies provides evidence that the universe is (1) shrinking, only (3) shrinking and expanding in a cyclic pattern (2) expanding, only

More information

GALAXIES AND STARS. 2. Which star has a higher luminosity and a lower temperature than the Sun? A Rigel B Barnard s Star C Alpha Centauri D Aldebaran

GALAXIES AND STARS. 2. Which star has a higher luminosity and a lower temperature than the Sun? A Rigel B Barnard s Star C Alpha Centauri D Aldebaran GALAXIES AND STARS 1. Compared with our Sun, the star Betelgeuse is A smaller, hotter, and less luminous B smaller, cooler, and more luminous C larger, hotter, and less luminous D larger, cooler, and more

More information

λ = 650 nm = c = m s 1 f =? c = fλ f = c λ = ( m s 1 ) ( m) = = Hz T = 1 f 4.

λ = 650 nm = c = m s 1 f =? c = fλ f = c λ = ( m s 1 ) ( m) = = Hz T = 1 f 4. Chapter 13 Stars Section 13.1 Astronomical measurements Worked example: Try yourself 13.1.1 CALCULATING THE FREQUENCY AND PERIOD OF LIGHT The speed of light in a vacuum is approximately 3.0 10 8 m s 1.

More information

Stars: Stars and their Properties

Stars: Stars and their Properties Stars: Stars and their Properties Astronomy 110 Class 10 WHEN I heard the learn d astronomer; When the proofs, the figures, were ranged in columns before me; When I was shown the charts and the diagrams,

More information

Lines of Hydrogen. Most prominent lines in many astronomical objects: Balmer lines of hydrogen

Lines of Hydrogen. Most prominent lines in many astronomical objects: Balmer lines of hydrogen The Family of Stars Lines of Hydrogen Most prominent lines in many astronomical objects: Balmer lines of hydrogen The Balmer Thermometer Balmer line strength is sensitive to temperature: Most hydrogen

More information

My God, it s full of stars! AST 248

My God, it s full of stars! AST 248 My God, it s full of stars! AST 248 N * The number of stars in the Galaxy N = N * f s f p n h f l f i f c L/T The Galaxy M31, the Andromeda Galaxy 2 million light years from Earth The Shape of the Galaxy

More information

Properties of Stars (continued) Some Properties of Stars. What is brightness?

Properties of Stars (continued) Some Properties of Stars. What is brightness? Properties of Stars (continued) Some Properties of Stars Luminosity Temperature of the star s surface Mass Physical size 2 Chemical makeup 3 What is brightness? Apparent brightness is the energy flux (watts/m

More information

Astronomy 122 Outline

Astronomy 122 Outline Astronomy 122 Outline This Class (Lecture 12): Stars Next Class: The Nature of Stars Homework #5 is posted. Nightlabs have started! Stellar properties Parallax (distance) Colors Spectral Classes Music:

More information

The Sun (chapter 14) some of this is review from quiz 3, but you should

The Sun (chapter 14) some of this is review from quiz 3, but you should Astro20 / Harpell Topics for Quiz 4 The quiz will have 20 multiple choice questions; several "fill in the blanks" about five short essay questions that may require sketches.. If you can answer everything

More information

The Family of Stars. Chapter 13. Triangulation. Trigonometric Parallax. Calculating Distance Using Parallax. Calculating Distance Using Parallax

The Family of Stars. Chapter 13. Triangulation. Trigonometric Parallax. Calculating Distance Using Parallax. Calculating Distance Using Parallax The Family of Stars Chapter 13 Measuring the Properties of Stars 1 Those tiny glints of light in the night sky are in reality huge, dazzling balls of gas, many of which are vastly larger and brighter than

More information

HOMEWORK - Chapter 17 The Stars

HOMEWORK - Chapter 17 The Stars Astronomy 20 HOMEWORK - Chapter 7 The Stars Use a calculator whenever necessary. For full credit, always show your work and explain how you got your answer in full, complete sentences on a separate sheet

More information

Chapter 11 Review. 1) Light from distant stars that must pass through dust arrives bluer than when it left its star. 1)

Chapter 11 Review. 1) Light from distant stars that must pass through dust arrives bluer than when it left its star. 1) Chapter 11 Review TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) Light from distant stars that must pass through dust arrives bluer than when it left its star. 1)

More information

Guiding Questions. Measuring Stars

Guiding Questions. Measuring Stars Measuring Stars Guiding Questions 1. How far away are the stars? 2. What is meant by a first-magnitude or second magnitude star? 3. Why are some stars red and others blue? 4. What are the stars made of?

More information

Types of Stars 1/31/14 O B A F G K M. 8-6 Luminosity. 8-7 Stellar Temperatures

Types of Stars 1/31/14 O B A F G K M. 8-6 Luminosity. 8-7 Stellar Temperatures Astronomy 113 Dr. Joseph E. Pesce, Ph.D. The Nature of Stars For nearby stars - measure distances with parallax 1 AU d p 8-2 Parallax A January ³ d = 1/p (arcsec) [pc] ³ 1pc when p=1arcsec; 1pc=206,265AU=3

More information

Astronomy 210 Spring 2017: Quiz 5 Question Packet 1. can: 2. An electron moving between energy levels

Astronomy 210 Spring 2017: Quiz 5 Question Packet 1. can: 2. An electron moving between energy levels Permitted energy levels Astronomy 210 Spring 2017: Quiz 5 Question Packet 1 1. An electron in energy level 1 2 can: (A) only emit a photon. (B) only absorb a photon. (C) either emit, or absorb a photon.

More information

Galaxies and Stars. 3. Base your answer to the following question on The reaction below represents an energy-producing process.

Galaxies and Stars. 3. Base your answer to the following question on The reaction below represents an energy-producing process. Galaxies and Stars 1. To an observer on Earth, the Sun appears brighter than the star Rigel because the Sun is A) hotter than Rigel B) more luminous than Rigel C) closer than Rigel D) larger than Rigel

More information

Life Cycle of a Star - Activities

Life Cycle of a Star - Activities Name: Class Period: Life Cycle of a Star - Activities A STAR IS BORN STAGES COMMON TO ALL STARS All stars start as a nebula. A nebula is a large cloud of gas and dust. Gravity can pull some of the gas

More information

Test #2 results. Grades posted in UNM Learn. Along with current grade in the class

Test #2 results. Grades posted in UNM Learn. Along with current grade in the class Test #2 results Grades posted in UNM Learn D C B A Along with current grade in the class F Clicker Question: If the Earth had no Moon then what would happen to the tides? A: The tides would not be as strong

More information

Astronomy. The Nature of Stars

Astronomy. The Nature of Stars Astronomy A. Dayle Hancock adhancock@wm.edu Small 239 Office hours: MTWR 10-11am The Nature of Stars Distances to stars A Star's brightness and Luminosity A Magnitude scale Color indicates a Star's temperature

More information

Astro Fall 2012 Lecture 8. T. Howard

Astro Fall 2012 Lecture 8. T. Howard Astro 101 003 Fall 2012 Lecture 8 T. Howard Measuring the Stars How big are stars? How far away? How luminous? How hot? How old & how much longer to live? Chemical composition? How are they moving? Are

More information

CASE STUDY FOR USE WITH SECTION B

CASE STUDY FOR USE WITH SECTION B GCE A level 325/0-A PHYSICS PH5 Assessment Unit CASE STUDY FOR USE WITH SECTION B Pre-Release Material To be opened on receipt A new copy of this Case Study will be given out in the examination 325 0A00

More information

5. A particular star has an angle of parallax of 0.2 arcsecond. What is the distance to this star? A) 50 pc B) 2 pc C) 5 pc D) 0.

5. A particular star has an angle of parallax of 0.2 arcsecond. What is the distance to this star? A) 50 pc B) 2 pc C) 5 pc D) 0. Name: Date: 1. How far away is the nearest star beyond the Sun, in parsecs? A) between 1 and 2 pc B) about 12 pc C) about 4 pc D) between 1/2 and 1 pc 2. Parallax of a nearby star is used to estimate its

More information

OPEN CLUSTER PRELAB The first place to look for answers is in the lab script!

OPEN CLUSTER PRELAB The first place to look for answers is in the lab script! NAME: 1. Define using complete sentences: Globular Cluster: OPEN CLUSTER PRELAB The first place to look for answers is in the lab script! Open Cluster: Main Sequence: Turnoff point: Answer the following

More information

Measuring the Stars. The measurement of distances The family of distance-measurement techniques used by astronomers to chart the universe is called

Measuring the Stars. The measurement of distances The family of distance-measurement techniques used by astronomers to chart the universe is called Measuring the Stars How to measure: Distance Stellar motion Luminosity Temperature Size Evolutionary stage (H-R diagram) Cosmic distances Mass The measurement of distances The family of distance-measurement

More information

AST Section 2: Test 2

AST Section 2: Test 2 AST1002 - Section 2: Test 2 Date: 11/05/2009 Name: Equations: E = m c 2 Question 1: The Sun is a stable star because 1. gravity balances forces from pressure. (!) Miniquiz 7, Q3 2. the rate of fusion equals

More information

Stellar Astronomy Sample Questions for Exam 3

Stellar Astronomy Sample Questions for Exam 3 Stellar Astronomy Sample Questions for Exam 3 Chapter 7 1. A protostar is formed by a) the rapid expansion of gas from an exploding star. b) the gravitational collapse of a rotating interstellar cloud.

More information

Magnitudes. How Powerful Are the Stars? Luminosities of Different Stars

Magnitudes. How Powerful Are the Stars? Luminosities of Different Stars How Powerful Are the Stars? Some stars are more powerful than others Power is energy output per. (Example: 00 Watts = 00 joules per second) Astronomers measure the power, or brightness of stars in ways:

More information

Lecture 10: The Hertzsprung-Russell Diagram Reading: Sections

Lecture 10: The Hertzsprung-Russell Diagram Reading: Sections Lecture 10: The Hertzsprung-Russell Diagram Reading: Sections 19.7-19.8 Key Ideas The Hertzsprung-Russell (H-R) Diagram Plot of Luminosity vs. Temperature for stars Features: Main Sequence Giant & Supergiant

More information

Announcements. Lecture 11 Properties of Stars. App Bright = L / 4!d 2

Announcements. Lecture 11 Properties of Stars. App Bright = L / 4!d 2 Announcements Quiz#3 today at the end of 60min lecture. Homework#3 will be handed out on Thursday. Due October 14 (next Thursday) Review of Mid-term exam will be handed out next Tuesday. Mid-term exam

More information

Midterm Study Guide Astronomy 122

Midterm Study Guide Astronomy 122 Midterm Study Guide Astronomy 122 Introduction: 1. How is modern Astronomy different from Astrology? 2. What is the speed of light? Is it constant or changing? 3. What is an AU? Light-year? Parsec? Which

More information

18. Which graph best represents the relationship between the number of sunspots and the amount of magnetic activity in the Sun?

18. Which graph best represents the relationship between the number of sunspots and the amount of magnetic activity in the Sun? 1. Which star has a surface temperature most similar to the surface temperature of Alpha Centauri? A) Polaris B) Betelgeuse C) Procyon B D) Sirius 2. Giant stars have greater luminosity than our sun mainly

More information

Types of Stars and the HR diagram

Types of Stars and the HR diagram Types of Stars and the HR diagram Full window version (looks a little nicer). Click button to get back to small framed version with content indexes. This material (and images) is copyrighted! See

More information

Stars: some basic characteristics

Stars: some basic characteristics Stars: some basic characteristics Stars! How bright are they? How massive are they? What are the different types? How long do they live? How hot are they? Stellar brightness and luminosity The apparent

More information

Instructions. Students will underline the portions of the PowerPoint that are underlined.

Instructions. Students will underline the portions of the PowerPoint that are underlined. STARS Instructions Students will underline the portions of the PowerPoint that are underlined. Nuclear Furnace 1. A star is like a gigantic nuclear furnace. 2. The nuclear reactions inside convert hydrogen

More information

The Night Sky. The Universe. The Celestial Sphere. Stars. Chapter 14

The Night Sky. The Universe. The Celestial Sphere. Stars. Chapter 14 The Night Sky The Universe Chapter 14 Homework: All the multiple choice questions in Applying the Concepts and Group A questions in Parallel Exercises. Celestial observation dates to ancient civilizations

More information

Intro to Astrophysics

Intro to Astrophysics Intro to Astrophysics Dr. Bill Pezzaglia 1 III. Introduction To Astrophysics A. Distances to Stars B. Binary Stars C. HR Diagrams 2 Updated: Nov 2007 A. Stellar Distances 1. Method of Parallax 2. Absolute

More information

Each star is born with a specific mass. This mass is the main factor in determining the star s brightness, temperature, expected lifetime, type of

Each star is born with a specific mass. This mass is the main factor in determining the star s brightness, temperature, expected lifetime, type of Each star is born with a specific mass. This mass is the main factor in determining the star s brightness, temperature, expected lifetime, type of death, and spectra. Stars are classified according to

More information

301 Physics 1/20/09. The Family of Stars. Chapter 12. Triangulation. Trigonometric Parallax. Course/Syllabus Overview Review of 301 stuff Start Ch.

301 Physics 1/20/09. The Family of Stars. Chapter 12. Triangulation. Trigonometric Parallax. Course/Syllabus Overview Review of 301 stuff Start Ch. 1/20/09 Course/Syllabus Overview Review of 301 stuff Start Ch. 12 More than just knowing various facts Understand how we arrive at these conclusions 301 Physics Physics Concepts Light Properties of (frequency,wavelength,energy)

More information

Observed Properties of Stars ASTR 2120 Sarazin

Observed Properties of Stars ASTR 2120 Sarazin Observed Properties of Stars ASTR 2120 Sarazin Extrinsic Properties Location Motion kinematics Extrinsic Properties Location Use spherical coordinate system centered on Solar System Two angles (θ,φ) Right

More information

Exam # 3 Tue 12/06/2011 Astronomy 100/190Y Exploring the Universe Fall 11 Instructor: Daniela Calzetti

Exam # 3 Tue 12/06/2011 Astronomy 100/190Y Exploring the Universe Fall 11 Instructor: Daniela Calzetti Exam # 3 Tue 12/06/2011 Astronomy 100/190Y Exploring the Universe Fall 11 Instructor: Daniela Calzetti INSTRUCTIONS: Please, use the `bubble sheet and a pencil # 2 to answer the exam questions, by marking

More information

Objectives. HR Diagram

Objectives. HR Diagram Objectives HR Diagram Questions from Yesterday Centripetal Force perpendicular to the rotation axis Acts to slow down collapse Strongest 90 deg from rotation axis Particles with an angle < 90 feel the

More information

Answer Key for Exam C

Answer Key for Exam C Answer Key for Exam C 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

More information

Answer Key for Exam B

Answer Key for Exam B Answer Key for Exam B 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

More information

Determining the Properties of the Stars

Determining the Properties of the Stars Determining the Properties of the Stars This set of notes by Nick Strobel covers: The properties of stars--their distances, luminosities, compositions, velocities, masses, radii, and how we determine those

More information

The Hertzprung-Russell Diagram. The Hertzprung-Russell Diagram. Question

The Hertzprung-Russell Diagram. The Hertzprung-Russell Diagram. Question Key Concepts: Lecture 21: Measuring the properties of stars (cont.) The Hertzsprung-Russell (HR) Diagram (L versus T) The Hertzprung-Russell Diagram The Stefan-Boltzmann Law: flux emitted by a black body

More information

Chapter 12 Review. 2) About 90% of the star's total life is spent on the main sequence. 2)

Chapter 12 Review. 2) About 90% of the star's total life is spent on the main sequence. 2) Chapter 12 Review TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) As a main-sequence star, the Sun's hydrogen supply should last about 10 billion years from the zero-age

More information

Astronomy Part 1 Regents Questions

Astronomy Part 1 Regents Questions Regents Questions 1. The Sun revolves around the center of A) Polaris B) Aldebaran C) Earth D) the Milky Way Galaxy 4. In which sequence are the items listed from least total mass to greatest total mass?

More information

Lecture 26 The Hertzsprung- Russell Diagram January 13b, 2014

Lecture 26 The Hertzsprung- Russell Diagram January 13b, 2014 1 Lecture 26 The Hertzsprung- Russell Diagram January 13b, 2014 2 Hertzsprung-Russell Diagram Hertzsprung and Russell found a correlation between luminosity and spectral type (temperature) 10000 Hot, bright

More information

Astr 5465 Feb. 6, 2018 Today s Topics

Astr 5465 Feb. 6, 2018 Today s Topics Astr 5465 Feb. 6, 2018 Today s Topics Stars: Binary Stars Determination of Stellar Properties via Binary Stars Classification of Binary Stars Visual Binaries Both stars visible Only one star visible Spectroscopic

More information

Answer Key for Exam D

Answer Key for Exam D Answer Key for Exam D 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

More information

Lecture 14: Studying the stars. Astronomy 111 Monday October 16, 2017

Lecture 14: Studying the stars. Astronomy 111 Monday October 16, 2017 Lecture 14: Studying the stars Astronomy 111 Monday October 16, 2017 Reminders Homework #7 due Monday I will give a lecture on DES and LIGO tomorrow at 4pm in the Mitchell Institute Studying the stars

More information

Exam 1 will cover. The Day of the Exam. Astronomy Picture of the Day: Today s Class: Measuring temperatures of stars

Exam 1 will cover. The Day of the Exam. Astronomy Picture of the Day: Today s Class: Measuring temperatures of stars September 25, 2013 Reading: Chapter 15, section 15.1. Exam 1 next class! Review Session tomorrow night, Sep. 26, at 7 pm in Duane G2B47. Naked eye observing session tonight at 8 pm. Volunteers for Astronomy

More information

PHYS 160 Astronomy Take-home Test #4 Fall 2017

PHYS 160 Astronomy Take-home Test #4 Fall 2017 PHYS 160 Astronomy Take-home Test #4 Fall 2017 Instructions: This is a take-home test. The test period starts Monday 11/27/2017 at 2:10pm and ends at Wednesday 11/29/2017 at 1:10pm. The test must represent

More information

L = 4 d 2 B p. 4. Which of the letters at right corresponds roughly to where one would find a red giant star on the Hertzsprung-Russell diagram?

L = 4 d 2 B p. 4. Which of the letters at right corresponds roughly to where one would find a red giant star on the Hertzsprung-Russell diagram? Fall 2016 Astronomy - Test 3 Test form B Name Do not forget to write your name and fill in the bubbles with your student number, and fill in test form B on the answer sheet. Write your name above as well.

More information

L = 4 d 2 B p. 1. Which outer layer of the Sun has the highest temperature? A) Photosphere B) Corona C) Chromosphere D) Exosphere E) Thermosphere

L = 4 d 2 B p. 1. Which outer layer of the Sun has the highest temperature? A) Photosphere B) Corona C) Chromosphere D) Exosphere E) Thermosphere Fall 2016 Astronomy - Test 3 Test form A Name Do not forget to write your name and fill in the bubbles with your student number, and fill in test form A on the answer sheet. Write your name above as well.

More information

Astronomy II (ASTR-1020) Homework 2

Astronomy II (ASTR-1020) Homework 2 Astronomy II (ASTR-1020) Homework 2 Due: 10 February 2009 The answers of this multiple choice homework are to be indicated on a Scantron sheet (either Form # 822 N-E or Ref # ABF-882) which you are to

More information

CHAPTER 28 STARS AND GALAXIES

CHAPTER 28 STARS AND GALAXIES CHAPTER 28 STARS AND GALAXIES 28.1 A CLOSER LOOK AT LIGHT Light is a form of electromagnetic radiation, which is energy that travels in waves. Waves of energy travel at 300,000 km/sec (speed of light Ex:

More information

Chapter 15 Lecture. The Cosmic Perspective Seventh Edition. Surveying the Stars Pearson Education, Inc.

Chapter 15 Lecture. The Cosmic Perspective Seventh Edition. Surveying the Stars Pearson Education, Inc. Chapter 15 Lecture The Cosmic Perspective Seventh Edition Surveying the Stars 15.1 Properties of Stars Our goals for learning: How do we measure stellar luminosities? How do we measure stellar temperatures?

More information

Astronomy 104: Second Exam

Astronomy 104: Second Exam Astronomy 104: Second Exam Stephen Lepp October 29, 2014 Each question is worth 2 points. Write your name on this exam and on the scantron. Short Answer A The Sun is powered by converting hydrogen to what?

More information

Selected Questions from Minute Papers. Outline - March 2, Stellar Properties. Stellar Properties Recap. Stellar properties recap

Selected Questions from Minute Papers. Outline - March 2, Stellar Properties. Stellar Properties Recap. Stellar properties recap Black Holes: Selected Questions from Minute Papers Will all the material in the Milky Way eventually be sucked into the BH at the center? Does the star that gives up mass to a BH eventually get pulled

More information

Basic Properties of the Stars

Basic Properties of the Stars Basic Properties of the Stars The Sun-centered model of the solar system laid out by Copernicus in De Revolutionibus (1543) made a very specific prediction: that the nearby stars should exhibit parallax

More information

CHAPTER 29: STARS BELL RINGER:

CHAPTER 29: STARS BELL RINGER: CHAPTER 29: STARS BELL RINGER: Where does the energy of the Sun come from? Compare the size of the Sun to the size of Earth. 1 CHAPTER 29.1: THE SUN What are the properties of the Sun? What are the layers

More information

Stellar Composition. How do we determine what a star is made of?

Stellar Composition. How do we determine what a star is made of? Stars Essential Questions What are stars? What is the apparent visual magnitude of a star? How do we locate stars? How are star classified? How has the telescope changed our understanding of stars? What

More information

Daily Science 04/04/2017

Daily Science 04/04/2017 Daily Science 04/04/2017 Which statement best describes the difference between type A stars and type B stars as shown in the diagram? a. Type A stars burn for a shorter amount of time than type B stars.

More information

Get ready for quiz # 5! Get out a ½ sheet and Calculator

Get ready for quiz # 5! Get out a ½ sheet and Calculator Get ready for quiz # 5! Get out a ½ sheet and Calculator The above image shows the solar eclipse earlier this month as covered and uncovered by several different solar observatories. The innermost image

More information

Stars: basic observations

Stars: basic observations Stars: basic observations Basic properties of stars we would like to know in order to compare theory against observations: Stellar mass M Stellar radius R Surface temperature - effective temperature T

More information

Phys 100 Astronomy (Dr. Ilias Fernini) Review Questions for Chapter 9

Phys 100 Astronomy (Dr. Ilias Fernini) Review Questions for Chapter 9 Phys 0 Astronomy (Dr. Ilias Fernini) Review Questions for Chapter 9 MULTIPLE CHOICE 1. We know that giant stars are larger in diameter than the sun because * a. they are more luminous but have about the

More information