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Geology 360 - Geology 360 Chandrasekhar Electron degeneracy...

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Geology 360  4/9/08 Chandrasekhar Electron degeneracy pressure Limit 1.44 solar masses 1983 Nobel prize White dwarves  Remnants of low-mass stars Composed of carbon or He Supported by electron degeneracy pressure Can’t be bigger than 1.4  solar masses Cool off to become “ black dwarfs” White dwarves in close binary systems can steal mass from their  companion star, gains H and He If it passes 1.4 solar masses H collapses and detonates its carbon Causes a type I supernova (exploding his mass star is type II) Measuring Distance to more distant stars: Brightness=luminosity divided by 4  distance squared π
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***method of standard candles: using a known  luminosity and measured brightness to  determine distance. 4/11/08 Neutron Stars A big ball of neutrons (~10% protons), like a gigantic atomic nucleus  1.4-3 solar masses~ 6km across
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