Astr 221 November 10, 2003: Gas Clouds  

Announcements

Early Stage of Protostar collapse

Mass graph

Question: Why do we call them O-B associations?

Question: How can we get unbound from bound?

Evolution after the Main Sequence

Virial theorem

Leaving the ZAMS

Evolutionary tracks graph

Why stars leave the main sequence

Question: Will the Sun go dark?

Hydrogen Shell burning

Evolutionary track of a one solar mass star

Contraction and Expansion

Question: Why do we see so many of the rare Red Giants

Core Contraction and Triple Alpha Reactions

Question: Why will happen when the He is burned to Carbon?

Low Mass Stars Continued

ZAMS and stars below 1 solar mass