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- Hayashi_track abstract "The Hayashi track is a luminosity–temperature relationship obeyed by infant stars of less than 3 solar masses in the pre-main-sequence phase of stellar evolution. On the Hertzsprung-Russell diagram, which plots luminosity against temperature, the track is a nearly vertical curve. After a protostar ends its phase of rapid contraction and becomes a T Tauri star, it is extremely luminous. The star then follows the Hayashi track downwards, becoming several times less luminous but staying at roughly the same surface temperature, until either a radiative zone develops, at which point the star starts following the Henyey track, or nuclear fusion begins, marking the beginning of the main sequence.The shape and position of the Hayashi track on the HR diagram depends on the star's mass and chemical composition. For solar-mass stars, the track lies at a temperature of roughly 4000 K. Stars on the track are nearly fully convective and have their opacity dominated by the H-ion. Stars less than 0.5 solar masses are fully convective even on the main sequence, but their opacity begins to be dominated by Kramers' opacity law after nuclear fusion begins, thus moving them off the Hayashi track. Stars between 0.5 and 3 solar masses develop a radiativezone prior to reaching the main sequence. Stars between 3 and 10 solar masses are fully radiative at the beginning of the pre-main-sequence. Even heavier stars are born onto the main sequence, with no PMS evolution.At an end of a low- or intermediate-mass star's life, the star follows an analogue of the Hayashi track, but in reverse—it increases in luminosity, expands, and stays at roughly the same temperature, eventually becoming a red giant.".
- Hayashi_track thumbnail PMS_evolution_tracks.svg?width=300.
- Hayashi_track wikiPageID "5116788".
- Hayashi_track wikiPageRevisionID "605791680".
- Hayashi_track colwidth "30".
- Hayashi_track hasPhotoCollection Hayashi_track.
- Hayashi_track subject Category:Astrophysics.
- Hayashi_track subject Category:Hertzsprung–Russell_classifications.
- Hayashi_track subject Category:Star_formation.
- Hayashi_track type Abstraction100002137.
- Hayashi_track type Act100030358.
- Hayashi_track type Activity100407535.
- Hayashi_track type Categorization101012712.
- Hayashi_track type Event100029378.
- Hayashi_track type Grouping101012360.
- Hayashi_track type Hertzsprung-RussellClassifications.
- Hayashi_track type PsychologicalFeature100023100.
- Hayashi_track type YagoPermanentlyLocatedEntity.
- Hayashi_track comment "The Hayashi track is a luminosity–temperature relationship obeyed by infant stars of less than 3 solar masses in the pre-main-sequence phase of stellar evolution. On the Hertzsprung-Russell diagram, which plots luminosity against temperature, the track is a nearly vertical curve. After a protostar ends its phase of rapid contraction and becomes a T Tauri star, it is extremely luminous.".
- Hayashi_track label "Hayashi track".
- Hayashi_track label "Hayashi-Linie".
- Hayashi_track label "Traccia di Hayashi".
- Hayashi_track label "Trajet de Hayashi".
- Hayashi_track label "Trilha de Hayashi".
- Hayashi_track label "Трек Хаяши".
- Hayashi_track label "林トラック".
- Hayashi_track label "林軌跡".
- Hayashi_track sameAs Hayashiho_stopa.
- Hayashi_track sameAs Hayashi-Linie.
- Hayashi_track sameAs Trajet_de_Hayashi.
- Hayashi_track sameAs Traccia_di_Hayashi.
- Hayashi_track sameAs 林トラック.
- Hayashi_track sameAs 하야시_경로.
- Hayashi_track sameAs Trilha_de_Hayashi.
- Hayashi_track sameAs m.0d3f1v.
- Hayashi_track sameAs Q504908.
- Hayashi_track sameAs Q504908.
- Hayashi_track sameAs Hayashi_track.
- Hayashi_track wasDerivedFrom Hayashi_track?oldid=605791680.
- Hayashi_track depiction PMS_evolution_tracks.svg.
- Hayashi_track isPrimaryTopicOf Hayashi_track.
