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1 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 by a change in the observer's position. The shift in angular position of an object as the object actually moves in space. 2. The relative brightness of the stars as we see them in our sky is represented by their bsolute magnitudes. pparent magnitude. Surface temperature. Luminosity. 3. Luminosity (absolute brightness) of a star depends on its. Temperature Radius istance from us oth and oth and 4. Which of the following stars has the hottest stellar surface temperature? M6 0 G5 2 K9 5. SalePlus dvertisement
2 2 of 6 5/2/2015 6:12 PM If it were possible to move a star closer to the arth then its apparent magnitude NUMR would while its absolute magnitude number would. ecrease; increase ecrease; stay the same Increase; decrease Increase; stay the same 6. In the above HR diagram sketch, which star is a white dwarf? 7. In the above HR diagram sketch, which star is a red giant?
3 3 of 6 5/2/2015 6:12 PM 8. In the above HR diagram, which main sequence star is bluish in color? 9. In the above HR diagram, which main sequence star is biggest in size? % of type stars have orbiting companions. O and and F F and G K and M 11. The H-R diagram is a diagram plotting the stars according to their pparent brightness and temperature. Spectral type and temperature. rightness and luminosity class. Luminosity and temperature. Mass and diameter. 12. Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star) 2II G2II G2III
4 4 of 6 5/2/2015 6:12 PM G1V O2II 13. Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OFGKM classification? Larger molecules require higher temperatures to show absorption lines. The spectra of hydrogen and helium are sufficient to classify stars. The spectra of larger molecules are too complicated. Larger molecules break apart at the high temperatures of stellar atmospheres. ll of the above. 14. The spectrum of a star shows the 656 nm absorption line shifted to 654 nm. Which of the following can we conclude about this star? The star is approaching us with an approximate speed of 1,800 km/sec. The star is receding with an approximate speed of 1,800 km/sec. The star is approaching us with an approximate speed of 900 km/sec. The star is receding with an approximate speed of 900 km/sec. The star is spinning rapidly. 15. What is the difference between spectroscopic and visual binaries? Spectroscopic binaries have double spectral lines but do not move. Visual binaries are pairs of stars in the same region in the sky but are not gravitationally interacting. visual binary does not show changes in the spectral lines. In a visual binary we can see two distinct stars; in spectroscopic binaries, the images of the two stars can not be resolved. 16. The study of eclipsing binary stars is very important because it allows astronomers to determine The distance between two stars. The speed of stars from the oppler shift of their spectral lines. The diameters of stars. The luminosity of each star. The brightness of each star.
5 5 of 6 5/2/2015 6:12 PM 17. If a main sequence, giant, and a supergiant all have the same spectral class, what characteristic is known to make these stars different? Luminosity. istance. Surface temperature. olor. It shows that the more massive stars are cooler. 18. What can we conclude about a star because its luminosity varies in an irregular pattern? The star is very young. The star is very old. The star is rotating. or. 19. can be used to measure the of nearby stars. Parallax measurements; radius The method of standard candles; brightness Interferometry; radius 20. If the distance between the arth and a star is measured using parallax measurements, how far apart in time should the two measurements be made to make the parallax measurement as accurate as possible? Instantaneously day Six months year
6 6 of 6 5/2/2015 6:12 PM
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