AST 1002 Study Guide - Midterm Guide: Asymptotic Giant Branch, Helium Flash, Planetary Nebula

• School: University of Florida
• Department: Astronomy
• Course: AST 1002
• Professor: Fagerberg Seigfred

Document Summary

Exam #3 review - ast 1002 - spring 2015. Chapter 12: what is hydrostatic equilibrium in the context of main sequence stars, on the main sequence, contraction stops because gravity = pressure. What is the expected main sequence to do with it (see also ch. Why are more massive stars more luminous on the main sequence: main sequence lifetime depends on the mass. Helium burning moves to a hot shell : helium reactions in the shell occur faster that before. The hot shell causes the outer layers to expand and cool. Star moves off the main sequence and into the red giant branch. Follow the main stages of post-main sequence evolution for a sun-like star on the hr diagram. Red giant: helium begins to fuse into carbon at >10^8 k. called triple alpha = 3he c, smaller core, burning shell, expaniding photospehere, after the core reaches 10^9 k, helium ignites to make carbon.