5 Written Questions

1. a group of post-helium-flash stars near the main sequence on the hertzsprung-russell diagram of a typical globular cluster
2. a powerful pressure produced by repulsion of closely packed electrons
3. young, variable pre-main-sequence stars associated with interstellar matter that show erratic changes in luminosity
4. a relationship between the period and average luminosity of a pulsating star
5. a loosely bound group of young stars in the disk of the galaxy; a galactic cluster

5 Matching Questions

1. dense core
2. pauli exclusion principle
3. supernova remnant
4. variable star
5. protostar

1. a a principle of quantum mechanics that says that two identical particles cannot simultaneously have the same position and momentum
2. b a nebula left over after a supernova detonates
3. c any of the regions of interstellar gas clouds that are slightly denser than normal and destined to collapse to form one or a few stars
4. d the earliest stage of a star's life before fusion commences and when gas is rapidly falling onto it
5. e a star whose luminosity varies

5 Multiple Choice Questions

1. the changes in size, luminosity, temperature, and chemical composition that occur as a star ages
   1. globular cluster
   2. stellar evolution
   3. interstellar extinction
   4. helium fusion
2. interstellar gas and dust
   1. interstellar reddening
   2. interstellar extinction
   3. stellar evolution
   4. interstellar medium
3. on the hertzsprung-russel diagram, the path followed by a point representing an evolving star
   1. evolutionary track
   2. emission nebula
   3. population I star
   4. population II star
4. the reddening of starlight passing through the interstellar medium resulting from the scattering of short wavelength light more than long wavelength light
   1. interstellar medium
   2. stellar evolution
   3. interstellar reddening
   4. interstellar extinction
5. a small, roundish, dark nebula in which stars are forming
   1. birth line
   2. bok globule
   3. red dwarf
   4. nebula

5 True/False Questions

1. type I cepheid → a population II cepheid variable star found in elliptical galaxies and in the halos of disk galaxies that is 1.5 magnitudes dimmer than a type I cepheid

   True        False

2. hydrogen shell fusion → the thermonuclear fusion of helium to produce carbon and oxygen

   True        False

3. type II cepheid → a population I cepheid variable star found in the disks of spiral galaxies

   True        False

4. red dwarf → any of the planetlike bodies with less than .08 M and more than about 13 M (jupiter); such bodies do not have enough mass to sustain fusion in their cores

   True        False

5. helium flash → the thermonuclear fusion of helium to produce carbon and oxygen

   True        False