Astrophysics (index)

Hayashi Track

(HR diagram track of evolution of some pre-main-sequence stars)

A Hayashi Track is a track along a H-R Diagram showing the evolution of a Pre-Main-Sequence Star, i.e., each point on the track indicates the position of that body at some point in its life. In particular, it outlines a period when the star is fully convective, something that happens in the early lifetimes of stars of up to 3 solar masses. The exact track depends upon the mass, Metallicity and Helium abundance of the star.

The track was worked out numerically and was and is checked against observations of Star-Forming Regions.