Henyey track

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Stellar evolution tracks (blue lines) for the pre-main-sequence. The nearly-horizontal curves are called Henyey tracks.
High-mass stars have nearly horizontal evolution tracks from their birth until they arrive on the main sequence. Lighter stars, first follow the nearly-vertical Hayashi track before bending left into the Henyey track.
The end (leftmost point) of every track is labeled with the star's mass in solar masses, and represents its position on the main sequence. The red curves labeled in years are isochrones at the given ages. In other words, stars

10^{5}

years old lie along the curve labeled

10^{5}

, and similarly for the other 3 isochrones.

The Henyey track is a path taken by pre-main-sequence stars with masses greater than 0.5 solar masses in the Hertzsprung–Russell diagram after the end of the Hayashi track. The astronomer Louis G. Henyey and his colleagues in the 1950s showed that the pre-main-sequence star can remain in radiative equilibrium throughout some period of its contraction to the main sequence.

The Henyey track is characterized by a slow collapse in near hydrostatic equilibrium, approaching the main sequence almost horizontally in the Hertzsprung–Russell diagram (i.e. the luminosity remains almost constant).^[1]

References[]

^ Fang, Herczeg, Rizzuto (2017). "Age Spreads and the Temperature Dependence of Age Estimates in Upper Sco". The Astrophysical Journal. 842 (2): 123. arXiv:1705.08612. Bibcode:2017ApJ...842..123F. doi:10.3847/1538-4357/aa74ca. S2CID 119087788. Retrieved July 26, 2021.

Henyey, L. G.; Lelevier, R.; Levée, R. D. (1955). "The Early Phases of Stellar Evolution". Publications of the Astronomical Society of the Pacific. 67 (396): 154–160. Bibcode:1955PASP...67..154H. doi:10.1086/126791.

v t Stars
Formation	Accretion Molecular cloud Bok globule Young stellar object Protostar Pre-main-sequence Herbig Ae/Be T Tauri FU Orionis Herbig–Haro object Hayashi track Henyey track
Evolution	Main sequence Red-giant branch Horizontal branch Red clump Asymptotic giant branch super-AGB Blue loop Protoplanetary nebula Planetary nebula PG1159 Dredge-up OH/IR Instability strip Luminous blue variable Blue straggler Stellar population Supernova Superluminous supernova / Hypernova
Spectral classification	Early Late Main sequence O B A F G K M Brown dwarf WR OB Subdwarf O B Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow Carbon S CN CH White dwarf Chemically peculiar Am Ap/Bp HgMn Helium-weak Barium Extreme helium Lambda Boötis Lead Technetium Be Shell B[e]
Remnants	Compact star White dwarf Helium planet Black dwarf Neutron Radio-quiet Pulsar Binary X-ray Magnetar Stellar black hole X-ray binary Burster SGR
Hypothetical	Blue dwarf Green Black dwarf Exotic Boson Electroweak Strange Preon Planck Dark Dark-energy Quark Q Black Gravastar Quasi-star Thorne–Żytkow object Iron Blitzar White hole Planck star
Stellar nucleosynthesis	Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process Carbon burning Neon burning Oxygen burning Silicon burning S-process R-process Fusor Nova Symbiotic Remnant Luminous red nova
Structure	Core Convection zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Stellar wind Bubble Bipolar outflow Accretion disk Protoplanetary disk Proplyd Asteroseismology Helioseismology Circumstellar dust Circumstellar envelope Eddington luminosity Kelvin–Helmholtz mechanism
Properties	Designation Dynamics Effective temperature Luminosity Kinematics Magnetic field Absolute magnitude Mass Metallicity Rotation Starlight Variable Photometric system Color index Hertzsprung–Russell diagram Color–color diagram
Star systems	Binary Contact Common envelope Eclipsing Symbiotic Multiple Cluster Open Globular Super Planetary system
Earth-centric observations	Sun Solar radio emission Solar System Sunlight Pole star Circumpolar Constellation Asterism Magnitude Apparent Extinction Photographic Radial velocity Proper motion Parallax Photometric-standard
Lists	Proper names Arabic Chinese Extremes Most massive Highest temperature Lowest temperature Largest volume Smallest volume Brightest Historical brightest Most luminous Nearest Nearest bright With exoplanets Brown dwarfs Red dwarfs White dwarfs Milky Way novae Supernovae Candidates Remnants Planetary nebulae Timeline of stellar astronomy
Related	Substellar object Brown dwarf Sub-brown dwarf Planet Galactic year Galaxy Guest Gravity Intergalactic Planet-hosting stars Tidal disruption event
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Henyey track

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