blue supergiant
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Blue supergiant — Blue supergiants (BSGs) are supergiant stars (luminosity class I) of spectral type O or B.They are extremely hot and bright, with surface temperatures of between 20,000 to 50,000°C. They typically have 10 to 50 solar masses on the Hertzsprung… … Wikipedia
Blue giant — For other uses, see Blue giant (disambiguation). Hertzsprung–Russell Diagram Spectral Type … Wikipedia
Supergiant — Supergiants are among the most massive stars. In the Hertzsprung Russell diagram they occupy the top region of the diagram. In the Yerkes spectral classification supergiants are class Ia (most luminous supergiants) or Ib (less luminous… … Wikipedia
blue giant — noun a very hot and very luminous star that emits visible light in the blue portion of the spectrum See Also: blue supergiant … Wiktionary
Red supergiant — Red supergiants (RSGs) are supergiant stars (luminosity class I) of spectral type K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive. Betelgeuse and Antares are the best known examples of … Wikipedia
Yellow supergiant — A yellow supergiant (YSG) is a supergiant star of spectral type F or G. [p. 366, The evolution of massive stars with mass loss, Cesare Chiosi and Andre Maeder, Annual review of astronomy and astrophysics 24 (1986), pp. 329 ndash;375.… … Wikipedia
Outline of astronomy — Mauna Kea in Hawaii is one of the world s premier observatory sites. Pictured is the W. M. Keck Observatory, an optical interferometer. The following outline is provided as an overview of and topical guide to astronomy: Astronomy – studies the… … Wikipedia
Orion (constellation) — For other uses, see Orion (disambiguation). Orion Constellation List of stars in Orion Abbreviation Ori Genitive Orionis … Wikipedia
Hypergiant — A hypergiant (luminosity class 0) is a star with a tremendous mass and luminosity, showing signs of a very high rate of mass loss. CharacteristicsThe word “hypergiant” is commonly used as a loose term for the most massive stars found, even though … Wikipedia
nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula … Universalium
