Stellar Astrophysics
ASTR 410
USC fall 2004
Assignment #6:
- Due December 1 (Wednesday) at 2pm.
Problems:
- From the textbook, Chapter 12:
- From the textbook, Chapter 13:
- Supplemental #1: Consider a molecular cloud with a
density of H2 molecules of 3000
cm-3. Assume stars form from such clouds, and that
there are 100 clouds in our Galaxy. If the mass of each
cloud is 5 x 104 times the mass of the Sun, and
10% of the mass is converted into stars of solar mass, how
many stars are formed in one year?
- Supplemental #2: Assume a star remains for
1010 years on the main sequence, and burns 10% of
its hydrogen. After this stage, the star will expand into a
red giant, and its luminosity will increase by a factor of
100. How long is the star in the red giant phase, if we
assume that the energy is produced only by burning the
remaining hydrogen?
