01:750:109 Chapter Notes - Chapter 9.1: Brown Dwarf, Degenerate Matter, Protostar
Document Summary
Why luminosity, surface temp, mass, and lifetime of main sequence star are all so closely related. Core temp in which a star achieves the 2 kinds of balance depends on its mass. Mass determines a star"s balancing point so it determines the rest of the star"s major properties and also determines which objects can become stars and which cannot. Stars w less mass than the sun need to contract more before fusion begins and come into balance w a lower core temp, lower luminosity, cooler surface, and smaller radius. Live longer than sun bc their lower fusion rates consume the fuel for fusion more slowly. Stars w more mass than the sun deed to contract less before fusion begins and come into balance w a higher core temp, higher luminosity, hotter surface, and larger radius. Live shorter than sun bc their higher fusion rates consume the fuel for fusion faster. High-mass end, maximum mass of star is around 150m sun.