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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 (equivalently, a boundary on the right-hand side of the H-R diagram) cooler than which hydrostatic equilibrium cannot be maintained; this boundary corresponds to a temperature around 4000 K.
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