Fifty years after the seminal paper by Prof. C. Hayashi, the field of pre–main sequence (PMS) evolution still plays a fundamental role in observational and theoretical astrophysics. In this contribution, I highlight the contribution made by Hayashi in establishing the theoretical foundation of early stellar evolution. Then, I discuss the changes of the classical theory introduced by the inclusion of protostellar evolution in PMS models and present selected results on young stars.
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© 2012 American Institute of Physics.
2012
American Institute of Physics
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