Dwarf star

Dwarf star

The term dwarf star refers to a variety of distinct classes of stars.

  • Dwarf star alone generally refers to any main sequence star, a star of luminosity class V.
    • Red dwarfs are low-mass main sequence stars.
    • Yellow dwarfs are main sequence (dwarf) stars with masses comparable to that of the Sun. The Sun is a yellow dwarf.
  • A blue dwarf is a low-mass star which is hypothesized to be the post-main sequence form of a red dwarf.
  • A white dwarf is a star composed of electron-degenerate matter, thought to be the final stage in the evolution of stars not massive enough to undergo a Type II supernova—stars less massive than roughly 9 solar masses.
  • A black dwarf refers to a white dwarf that has cooled sufficiently such that it no longer emits any visible light.
  • A brown dwarf is a sub-stellar object not massive enough to ever fuse hydrogen into helium—less than about 0.08 solar masses.

See also

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Look at other dictionaries:

  • dwarf star — dwarf′ star′ n. astron. a star with relatively small mass and low or average luminosity, as the sun • Etymology: 1910–15 …   From formal English to slang

  • dwarf star — Astron. any of the ordinary main sequence stars, as those of spectral types O, B, A, F, G, K, and M. Also called dwarf. Cf. white dwarf. [1910 15] * * * Any star of average or low luminosity, mass, and size, including white dwarf stars and red… …   Universalium

  • dwarf star — noun : dwarf 4 * * * Astron. any of the ordinary main sequence stars, as those of spectral types O, B, A, F, G, K, and M. Also called dwarf. Cf. white dwarf. [1910 15] * * * dwarf star, = dwarf (def. 3): (Cf. ↑dwarf) »Discovery of flareups on two …   Useful english dictionary

  • dwarf star — žvaigždė nykštukė statusas T sritis fizika atitikmenys: angl. dwarf star vok. Zwergstern, m rus. звезда карлик, f pranc. naine, f; étoile naine, f …   Fizikos terminų žodynas

  • dwarf star — noun A star that is located in the main sequence in the Hertzsprung Russell diagram; fuses hydrogen into helium in its core. Syn: dwarf, main sequence star …   Wiktionary

  • dwarf star — /ˈdwɔf sta/ (say dwawf stah) noun a star of relatively small volume and low luminosity, but often of high density …   Australian English dictionary

  • white dwarf star — Any of a class of small, faint stars representing the end point of the evolution of stars without enough mass to become neutron stars or black holes. Named for the white colour of the first ones discovered, they actually occur in a variety of… …   Universalium

  • red dwarf star — noun a small, old, relatively cool star; approximately 100 times the mass of Jupiter • Syn: ↑red dwarf • Hypernyms: ↑star • Hyponyms: ↑flare star …   Useful english dictionary

  • white dwarf star — noun a faint star of enormous density • Syn: ↑white dwarf • Hypernyms: ↑star …   Useful english dictionary

  • Q Velorum (dwarf star) — Starbox short name=q Velorum epoch=J2000.0 constell=Vela ra=10h 14m 44.2s dec=−42° 07 19 spectral=A2V appmag v=+3.85 dist ly=103 ± 2 dist pc=32 ± 1 names=HR 4023, HD 88955, CD 41°5713, FK5 382, HIP 50191, SAO 221895, GC 14076q Velorum (q Vel) is… …   Wikipedia

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