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The stellar birthline is a predicted line on the Hertzsprung–Russell diagram that relates the effective temperature and luminosity of pre-main-sequence stars at the start of their contraction.[1] Prior to this point, the objects are accreting protostars, and are so deeply embedded in the cloud of dust and gas from which they are forming that they radiate only in far infrared and millimeter wavelengths. Once stellar winds disperse this cloud, the star becomes visible as a pre-main-sequence object. The set of locations on the Hertzsprung–Russell diagram where these newly visible stars reside is called the birthline, and is found above the main sequence.
The location of the stellar birthline depends in detail on the accretion rate onto the star and geometry of this accretion, i.e. whether or not it is occurring through an accretion disk. This means that the birthline is not an infinitely thin curve, but has a finite thickness in the Hertzsprung-Russell diagram.
stellar, birthline, this, article, relies, largely, entirely, single, source, relevant, discussion, found, talk, page, please, help, improve, this, article, introducing, citations, additional, sources, find, sources, news, newspapers, books, scholar, jstor, ma. This article relies largely or entirely on a single source Relevant discussion may be found on the talk page Please help improve this article by introducing citations to additional sources Find sources Stellar birthline news newspapers books scholar JSTOR March 2024 The stellar birthline is a predicted line on the Hertzsprung Russell diagram that relates the effective temperature and luminosity of pre main sequence stars at the start of their contraction 1 Prior to this point the objects are accreting protostars and are so deeply embedded in the cloud of dust and gas from which they are forming that they radiate only in far infrared and millimeter wavelengths Once stellar winds disperse this cloud the star becomes visible as a pre main sequence object The set of locations on the Hertzsprung Russell diagram where these newly visible stars reside is called the birthline and is found above the main sequence The location of the stellar birthline depends in detail on the accretion rate onto the star and geometry of this accretion i e whether or not it is occurring through an accretion disk This means that the birthline is not an infinitely thin curve but has a finite thickness in the Hertzsprung Russell diagram See also editHayashi track Henyey track Pre main sequence star Protostar Stellar isochrone T Tauri starReferences edit Stahler S W 1983 The Birthline for Low Mass Stars Astrophysical Journal 274 822 Bibcode 1983ApJ 274 822S doi 10 1086 161495 External links edithttp jila colorado edu pja stars02 lecture29 ps several low quality plots with the stellar birthline nbsp This article about stellar evolution is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Stellar birthline amp oldid 1213467395, wikipedia, wiki, book, books, library,
