Day 13: Low- mass Star Evolu5on
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1 Day 13: Low- mass Star Evolu5on Reading and MasteringAstronomy Ques5ons Review of star forma5on and degeneracy pressure LT: Star Forma5on and Life5mes Mini- lecture: Low- mass star evolu5on Break Mini- lecture: Low- mass star evolu5on cont. Lab: Cluster Ages and Masses
2 Star Forma5on
3 Planet Forma5on
4 Planet Forma5on
5 Gas Giants vs Rocky Planets
6 Brown Dwarfs
7 Degeneracy Pressure
8 Mass of stars formed
9 Mass of stars formed
10 Consider the informa5on given below about the life5me of three main sequence Stars A, B, and C. Star A will be a main sequence star for 45,000 million years. Star B will be a main sequence star for 70 million years. Star C will be a main sequence star for 2 million years Which of the following is a true statement about these stars? A. Star A has the greatest mass. B. Star C has the greatest mass. C. Stars A, B and C all have approximately the same mass. D. There is not enough informa5on to determine the answer.
11 Consider the informa5on given below about the life5me of three main sequence Stars A, B, and C. Star A will be a main sequence star for 45,000 million years. Star B will be a main sequence star for 70 million years. Star C will be a main sequence star for 2 million years Which of the following is a true statement about these stars? A. Star A has the greatest mass. B. Star C has the greatest mass. C. Stars A, B and C all have approximately the same mass. D. There is not enough informa5on to determine the answer.
12 Which of the following statements best describes how the life5mes compare between a star that has a mass equal to the Sun and a star containing three 5mes more mass than the Sun? A. The star with the same mass as the Sun will live more than three 5mes longer than the other star. B. The star with the same mass as the Sun will live three 5mes longer than the other star. C. The two stars will have the same life5me. D. The star with the same mass as the Sun will live three 5mes shorter than the other star.
13 Which of the following statements best describes how the life5mes compare between a star that has a mass equal to the Sun and a star containing three 5mes more mass than the Sun? A. The star with the same mass as the Sun will live more than three 7mes longer than the other star. B. The star with the same mass as the Sun will live three 5mes longer than the other star. C. The two stars will have the same life5me. D. The star with the same mass as the Sun will live three 5mes shorter than the other star.
14 What happens when a low- mass main sequence star runs out of hydrogen and fusion in the core stops? A. The core becomes larger B. The core becomes smaller C. The core becomes flawer D. The core becomes less dense
15 What happens when a low- mass main sequence star runs out of hydrogen and fusion in the core stops? A. The core becomes larger B. The core becomes smaller C. The core becomes flawer D. The core becomes less dense
16
17 Degeneracy Pressure Halts Core Collapse
18 Why do red giant stars become larger? A. The collapsing gas cloud rebounds when it hits the core B. The core requires a larger star to spark helium fusion C. Helium fusion releases so much more energy that pressure causes the star to expand D. Hydrogen fusion around but outside of the core increases the temperature of the outer layers
19 Why do red giant stars become larger? A. The collapsing gas cloud rebounds when it hits the core B. The core requires a larger star to spark helium fusion C. Helium fusion releases so much more energy that pressure causes the star to expand D. Hydrogen fusion around but outside of the core increases the temperature of the outer layers
20
21 The Sun as a Red Giant
22 Planetary Nebulae
23 Planetary Nebulae
24 Summary Planets form during star forma5on Degeneracy Pressure supports dense mawer Stars leave Main Sequence when hydrogen at core is gone Low- mass stars burn helium un5l it is used up. AZerward, the outer layers of the star become a planetary nebula and the core becomes a white dwarf
25 Homework LT: Star Forma5on and Life5mes Lab: Cluster Age and Masses Reading Ch. 17.3, 17.4 (p ) MasteringAstronomy: High Mass Star Evolu5on
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