Problems for 6 May 1996

You can hand in the following problems at beginning of class on Monday 6 May. If you have more than one page, please staple them together. And don't forget to include your name. Also, please write at the top near your name that these are the problems for 6 May.

What distinguishes population I and II stars and how does this relate to the history of the Galaxy?
- Reading: Chapter 21 Stellar Maturity and Old Age , Section 21-3
- Questions: 21-9, 21-10.
How can big stars contribute new material to the interstellar medium besides by exploding?
- Reading: Chapter 21 Stellar Maturity and Old Age , Section 21-4.
How are heavy elements made in stars and how do the heavy elements get into the interstellar medium?
- Reading: Chapter 22 The deaths of stars , Sections 22-1,2,4,5
- Questions: 22-3, 22-16.
- Question S1) Where are elements beyond helium made? Is there any difference between what is made in medium mass stars and what is made in very massive stars?
- Question S2) Describe three processes by which heavy elements can be distributed to the interstellar medium.
How did the Galaxy get to be the shape it is?
- Reading: Review Chapter 25 Our Galaxy , Section 25-2. Then, reason using the material in the preceding sections.
- Question S3) Based on what you have learned, were the halo stars made before the disk stars, or was it the reverse? Explain.
- Question S4) Why do you think the part of the Galaxy that has gas and young stars is shaped like a fried egg rather than a hard boiled egg?

Davison E. Soper, Institute of Theoretical Science, University of Oregon, Eugene OR 97403 USA soper@bovine.uoregon.edu