Which type of stars commonly follows the Hayashi Track?

The Hayashi Track is a concept in stellar evolution that describes the path that pre-main-sequence stars take on the Hertzsprung-Russell diagram as they evolve towards the main sequence. This track is characterized by stars that are still in the process of contracting and heating while conserving a significant amount of their initial mass.

Red dwarfs, which are low-mass stars, are primarily found on the Hayashi Track. These stars are smaller in mass and have relatively low luminosity compared to larger stars. As red dwarfs contract, they cool and are able to maintain their low-energy state efficiently, which is consistent with the behavior we observe along the Hayashi Track. Their evolutionary time scales are much longer than those of more massive stars, as they can spend billions of years in the contracting phase before reaching the main sequence.

Other types of stars such as giant stars and supernova remnants do not follow the Hayashi Track because they are in much later stages of stellar evolution. Massive stars, although they start their lives on a path that involves rapid expansion and eventual death, do not take the same evolutionary route as red dwarfs. Therefore, red dwarfs are the primary stars that exhibit the characteristics and behavior of the Hayashi Track during their evolution.