AST320H1 Study Guide - Final Guide: Black-Body Radiation, Type Ii Supernova, Southern Railway Multiple Unit Numbering And Classification
11 Aug 2016
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= 0. 2(1 + x)cm2 g 1 d ln p d ln t. This is when thermal pulses begin: when this ends, the star doesn"t heat up enough to start fusing again, so it goes to white dwarf. Life of a 5 m star: main sequence (h he, contracts until sc limit, burning he in core until exhaustion, contracts until sc limit to degenerate core, maybe c ash, white dwarf. Life of a high-mass star: main sequence (h he, goes through all the exhaustions and reaching of sc limits, reaches iron, and then goes supernova. Stellar timescales: the free-fall timescale/dynamical timescale essentially describes the amount of time a star takes to respond to mechanical vibrations or oscillations. It"s longer than the dynamical timescale: nuclear timescale refers to the amount of time it will take the star to exhaust its sources of nuclear fusion. This one is really long: so tnuc > tkh > tdyn > tcoll.
