protostellar
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Protostar — A protostar is a large object that forms by contraction out of the gas of a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in the process of star formation. For a solar mass star it lasts about 100,000… … Wikipedia
Hayashi track — The Hayashi track is a path taken by protostars in the Hertzsprung Russell diagram after the protostellar cloud has reached approximate hydrostatic equilibrium. In 1961 Chushiro Hayashi showed that there is a minimum effective temperature… … Wikipedia
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