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Ay 123 Lecture 12 - Modeling Stellar Evolution Hayashi track for pre-MS evolution: Proto-stars follow track of declining luminosity at fixed temperature Area to the right of the track is `forbidden’ in sense of not being in HS equilibrium Pre-Main Sequence Evolution and Timescales Main Sequence and Post Main Sequence Evolution and Timescales: Shell Burning and Transition to Red Giant Phase • Shell burning maintains a fixed location within a star • Collapse of core is accompanied by envelope expansion