AST201H1 Chapter Notes -Interstellar Cloud, Solar Mass, Protostar
9 May 2013
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AST201H1 Full Course Notes
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Stars are held together by support of internal heat and pressure. Structure of star is variation in temperature, density, and pressure. Mass mass of star must = sum of masses of its shell. Energy amount of energy flowing out of top layer in star must = to amount of energy coming in at bottom generated in all layers inside star. Hydrostatic equilibrium balance between weight and pressure. Weight of each layer of star must be supported by layer below. Inside of star is made up of gas, means it must be balanced by temperature and density: Energy leaving surface of star is luminosity means luminosity must = sun of energy. If pressure too low, weight from above will compress and push down the layer. If pressure to high, weight layer will expand and lift the layers above too. Pressure in each layer much grow larger with increasing depth to support weight.
