Collapsar

Star that has undergone gravitational collapse

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Collapsar type based on initial mass and metallicity

A collapsar (a portmanteau word formed by "collapsed" + "star") is a star which has undergone gravitational collapse.[1] When a star no longer has enough fuel for significant fusion reactions, there are three possible outcomes, depending on the remnant star's mass: If it is less than the Chandrasekhar limit (1.4 solar masses), the star will stabilize and shrink, becoming a white dwarf; between the Chandrasekhar limit and the Tolman–Oppenheimer–Volkoff limit (approximately 2.9 M☉), it will become a neutron star; and above the Tolman–Oppenheimer–Volkoff limit, the star will become a black hole. However, it is theorized that the high density of neutron star cores allow for quark matter and, as a result, a star that is more massive than even the Tolman–Oppenheimer–Volkoff limit, yet still is not a black hole.[2]

## See also

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* List of collapsars
* Shell collapsar
* Gamma-ray burst
* Compact star

## References

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Look up collapsar or black hole in Wiktionary, the free dictionary.

1. ^ "COLLAPSAR | Meaning & Definition for UK English | Lexico.com". Lexico Dictionaries | English. Archived from the original on March 23, 2022. Retrieved 2022-03-23.
2. ^ Rueda, Jorge A.; Ruffini, Remo (2012). "On the Induced Gravitational Collapse of a Neutron Star to a Black Hole by a Type Ib/C Supernova". The Astrophysical Journal. 758 (1): L7. arXiv:1206.1684. Bibcode:2012ApJ...758L...7R. doi:10.1088/2041-8205/758/1/L7. S2CID 119103016.

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Stellar core collapse

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