The answers to these review questions are at the bottom of this page.

1. Common red giant variable stars such as Mira that vary slowly in brightness are called (Select one.)

A) irregular variables.

B) eclipsing binaries.

C) RR Lyrae variables.

D) long-period variables.

E) Cepheid variables.

2. The period-luminosity relation applies to (Select one.)

A) eclipsing binaries.

B) Mira variables.

C) Cepheid variables.

D) irregular variables.

E) RR Lyrae variables.

3. Variable stars with very short regular periods, found mainly in clusters, are (Select one.)

A) Mira variables.

B) eclipsing binaries.

C) Cepheid variables.

D) RR Lyrae variables.

E) irregular variables.

4. If one Cepheid variable has the same period as another Cepheid but appears 4 magnitudes brighter, then its absolute magnitude is (Select one.)

A) 1 magnitude fainter.

B) 4 magnitudes brighter.

C) 1/4 magnitude fainter.

D) 4 magnitudes fainter.

E) the same.

5. The most massive stars are about ________ times more massive than the Sun.

6. The least massive stars are about _________ percent as massive as the Sun.

7. _______________ variable stars have been used to measure the distance to nearby galaxies.

8. All RR Lyrae stars have the same ____________ magnitude.

9. Star clusters with irregular shapes and containing stars with relatively large amounts of heavier elements are called (Select one.)

A) Population I areas.

B) star clusters.

C) open clusters.

D) Population II areas.

E) globular clusters.

10. Star clusters made of many thousands of older stars are called (Select one.)

A) star clusters.

B) open clusters.

C) Population II areas.

D) globular clusters.

E) Population I areas.

11. Most known globular clusters in the milky Way are in the galactic (Select one.)

A) disk.

B) spiral arms.

C) halo.

D) plane.

E) hub.

12. The age of an open cluster can be determined from its (Select one.)

A) horizontal branch.

B) number of Population II stars.

C) star count.

D) color.

E) temperature-luminosity diagram.

13. ____________ cluster stars have much lower concentrations of heavier elements than open cluster stars.

14. Younger stars are usually found in ___________ clusters.

15. The ___________ of globular clusters, based on their temperature-luminosity diagrams, are all about the same.

16. _____________ binaries are discovered by analysis of the motion of one component star.

17. A globular cluster will have a ___________ main sequence than the open cluster.

1. D
2. C
3. D
4. E
5. 50
6. 7
7. Cepheid (or RR Lyrae)
8. absolute
9. C
10. D
11. C
12. E
13. Globular
14. open or galactic
15. ages
16. Astronometric
17. shorter