The Hayashi track is a luminosity–temperature relationship obeyed by infant stars of less than 3 M ☉ in the pre-main-sequence phase (PMS phase) of stellar evolution. It is named after Japanese astrophysicist Chushiro Hayashi.

May 28, 2024 · The Hayashi Track is a path on the Hertzsprung-Russell diagram (H-R diagram) that describes the evolutionary trajectory of fully convective, pre-main-sequence stars or protostars. Named after Japanese astrophysicist Chushiro Hayashi, this track outlines the phase where a protostar contracts and decreases in luminosity while maintaining roughly ...

Apr 8, 2024 · The Hayashi Track is a theoretical evolutionary path that stars follow on the Hertzsprung-Russell diagram as they evolve. It was first proposed by Japanese astrophysicist Chushiro Hayashi in the 1960s.

The Hayashi limit is a theoretical constraint upon the maximum radius of a star for a given mass. When a star is fully within hydrostatic equilibrium —a condition where the inward force of gravity is matched by the outward pressure of the gas—the star …

The Hayashi track is mainly a theoretical construct instead of an observational fact. This is because most of the track, if it exists, is not visible because of dust obscuration and the deuterium burning sequence.

May 5, 2024 · The Hayashi tracks, depicted as vertical blue lines on the H-R diagram, outline the evolution of pre-main sequence stars in a fully convective phase. This phase, occurring in stars up to 3 solar masses, is marked by the star contracting towards its final size while maintaining convective equilibrium .

These paths on the HR diagram for collapsing protostars are called Hayashi tracks. There is a region to the right of the HR diagram where it is not possible for stable protostars to exist. This region is called the Hayashi forbidden zone.

A Hayashi track is a track or path on a H-R diagram (HRD) that shows 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.

Mar 27, 2025 · It is named after the Japanese astrophysicist Chushiro Hayashi (1920–2010). Hayashi and Henyey tracks: The Hayashi track (the near-vertical part of the evolutionary pathways) and Henyey track (the near-horizontal parts) for stars of different mass evolving on to the main sequence.

Hayashi Track Stars in this region of the Hertzsprung-Russell diagram are not hot enough to ionize hydrogen, so the surface of the star is atomic hydrogen and the interior is ionized . At the boundary, the opacity becomes small for the outer surface, which is at K.