CHEM 222 Chapter Notes - Chapter 3: Exotic Matter, 1Time Airline, Massive Compact Halo Object
28 Apr 2014
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A star spends most of its life on the main sequence it produces energy. It slowly becomes hotter and brighter through hydrogen to helium fusion. It moves off the main sequence as it begins helium fusion (typically becomes larger, cooler, and brighter) Stars larger than 8 solar masses finish their lives as supernovae. Stars the size of the sun move into a red giant phase before gently collapsing into white dwarves. If they"re a bit larger they can collapse into neutron stars or black holes. Small stars (smaller than 5 solar masses) collapse under their own gravity. They become smaller and temporarily hotter as gravitational energy converts into heat white dwarves. They can also pull nearby material in with their gravitational force, producing a type ia supernova. Very large stars (between 5-20 solar masses) go through a yellow-supergiant, Variation in brightness is related to absolute magnitude. 3. 1. 7 a distance scale based on the intrinsic brightness of stars.
