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((Multiple issues|
((more citations needed|date=August 2010))
((one source|date=August 2010))
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[[File:PMS evolution tracks.svg|thumb|Stellar evolution tracks (blue lines) for the pre-main-sequence. The nearly-horizontal curves are called Henyey tracks.<br />
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. <br />
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 <math>10^5</math> years old lie along the curve labeled <math>10^5</math>, and similarly for the other 3 isochrones.]]

The '''Henyey track ''' is a path taken by [[pre-main-sequence star]]s with masses greater than 0.5 [[solar mass]]es 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).<ref>((cite journal| vauthors   = Fang, Herczeg, Rizzuto| date=2017 | title=Age Spreads and the Temperature Dependence of Age Estimates in Upper Sco | journal= The Astrophysical Journal| volume=842| issue=2 | page=123 | doi= 10.3847/1538-4357/aa74ca | arxiv= 1705.08612 | bibcode=2017ApJ...842..123F | s2cid=119087788 | doi-access=free ))</ref>

==See also==
* [[Historical brightest stars]]
* [[List of brightest stars]]
* [[List of most luminous stars]]
* [[List of nearest bright stars]]
* [[List of Solar System objects in hydrostatic equilibrium]]
* [[Stellar evolution]]
* [[Stellar birthline]]
* [[Stellar isochrone]]

==References==
((Reflist))

*((Cite journal |last1=Henyey |first1=L. G. |last2=Lelevier |first2=R. |last3=Levée |first3=R. D. |date=1955 |title=The Early Phases of Stellar Evolution |journal=Publications of the Astronomical Society of the Pacific |volume=67 |issue=396 |pages=154–160 |doi= 10.1086/126791|bibcode = 1955PASP...67..154H |doi-access=free ))

((Star))
((Portal bar|Physics|Mathematics|Astronomy|Spaceflight|Outer space|Solar System|Science))

[[Category:Stellar evolution]]
[[Category:Hertzsprung–Russell classifications]]


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