Summary Chapter 12 Stellar Evolution_2

Summary Chapter 12 Stellar Evolution_2 - Chapter Summaries...

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Chapter Summaries Chapter 12: Stellar Evolution 1. A contracting cloud is defined to be a star when it begins fusing Hydrogen into Helium. 2. A Main Sequence star = The rate of fusion in the core is high enough for radiation to balance contraction. (Gravitational Equilibrium) 3. The MASS of the star determines its “fate” 4. Summary Table (from ppt lecture): Low mass star Intermediate High mass star < 2 M SUN 2 to 8 M SUN > 8 M SUN protostar protostar Yellow main sequence Blue main sequence Red Giant (H shell) Red Giant (H shell) Helium core burning star Helium core burning super giant Red Giant (H, He shells) Super Giant (multiple) Planetary nebula Super Nova core exposed core collapses White Dwarf Neutron Star/Black Hole 5. Know general characteristics of small and high mass stars: lifetimes (slow/fast); compositions (small: Carbon core, etc // high: eventually Iron core, lots of shells, etc) electron/neutron degeneracy 6. In general, understand the HR diagram, and all the information it provides. For example, the main sequence info below:
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This note was uploaded on 09/08/2010 for the course ASTR 101 at San Jose State University .

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Summary Chapter 12 Stellar Evolution_2 - Chapter Summaries...

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