A pre-main-sequence star with a developing radiative core can contract along a relatively horizontal path toward higher effective temperature in the Hertzsprung-Russell diagram. This differs from the nearly vertical fully convective Hayashi track.
The Henyey track, also known as the Henyey-Greenstein phase function, is a mathematical function used in the field of radiative transfer, particularly in the context of light scattering in media such as atmospheric particles, biological tissues, or other scattering materials. The Henyey-Greenstein function describes how light is scattered by particles and is characterized by a single parameter \( g \), which represents the asymmetry of the scattering.
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