NATS 1585 Lecture Notes - Lecture 7: Red Giant, Razor Strop, Flattening
21 Sep 2017
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Flattening: collisions between particles in the cloud cause it to flatten into a disk. Convective contraction: surface temperature remains near 3000 k while convection is main energy transport mechanism. Radiate contraction: core temperature continues to rise until star begins fusion. Life tracks for different masses: models show that sun required about 30 million years to go from protostar to. Main sequence: higher mass stars form faster, lower mass stars form slower. The laws of quantum mechanics prohibit two electrons from occupying the same state in the same place. Doesn"t depend on heat content: thermal pressure: Depends on heat content, it is the main form of pressure in most stars. Infrared observations can reveal recently formed brown dwarfs because they are relatively hot. Radiation pressure: photons exert slight amount of pressure when they strike matter, very massive proto stars are so luminous they collective pressure of photons drive their matter into space. Stars more massive than 150msun would blow apart.
