1. Chapter 12

2. 1. Using information in the back of your textbook, determine the parallax angle to the very closest star.
a) 0.23 arcsec
b) 4.23 arcsec
c) 0.77 arcsec
d) 1.30 arcsec

3. 2. Consider two stars in the constellation Pasta Major: alpha Tortellini (bright in the UV, dim in the IR) beta Linguini (dim in the UV, bright in the IR)
Which star is hotter?
a) alpha Tortellini
b) beta Linguini
c) too little information to answer

4. 3. Star A has a radius R and a temperature T
3. Star A has a radius R and a temperature T. Star B has the same temperature and is at the same distance from the Sun as star A. However, it is 4 times larger than star A. How many times more luminous is star B?
a) 16
b) 4
c) both have the same luminosity
d) not enough information to tell

5. 4. Star A has a radius R and a temperature T
4. Star A has a radius R and a temperature T. Star B is at the same distance from the Sun as star A. However, it is 4 times larger than star A and two times cooler. How many times more luminous is star B?
a) 16
b) 4
c) both have the same luminosity
d) not enough information to tell

6. Chapter 13

7. 5.What causes the red color?
a) Hydrogen emission
b) Hydrogen absorption
c) Doppler shifted radiation
6.The cone shaped object is
a) Cold dust and gas obscuring radiation
b) Bi-polar jet

8. 7. The nebulae around protostars are shaped into disks because of the same process that causes dough to become flat when it is
a) spun in the air like pizza dough
b) rolled with a pin like pizza dough
c) squashed between plates like dough for a burrito
d) baked on a flat sheet like a cookie.

9. 8. The factors that tend to work against collapse are
I. The magnetic field of the cloud
II. The presence of a supernova nearby
III. The existence of molecules in the gas
IV. Heat in the gas
V. rotation of the cloud
I, III, V
I, IV, V
II, III, V
II, IV, V
III, IV, V

10. 9. A B0 Main Sequence star is 17
9. A B0 Main Sequence star is 17.5 times more massive than the Sun and 30,000 times more luminous. Such a star will spend approximately _____ years on the Main Sequence.
a) 30,000
b) 6 million
c) 1,700
d) 1.7x1013
e) 17.5x1013

11. A C B
10. Youngest to oldest:
a) B, C, A
b) A, C, B
c) C, A, B
d) C, B, A

12. 11. Which of the following sequences correctly describes the evolution of the Sun from young to old?
a) white dwarf, red giant, main sequence, protostar
b) red giant, main-sequence, white dwarf, protostar
c) protostar, red giant, main sequence, white dwarf
d) protostar, main sequence, white dwarf, red giant
e) protostar, main sequence, red giant, white dwarf

13. 12. Stars like the Sun probably do not form iron cores during their evolution because
a) all of the iron is ejected when they become planetary nebulae
b) their cores never get hot enough for them to make iron by nucleosynthesis
c) the iron they make by nucleosynthesis is all fused into carbon
d) their strong magnetic fields keep their iron in the atmosphere
e) none of the above

14. C A B D E