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Supergiant

(Supergiant Star)
(very large giant star)

Supergiant (or Supergiant Star) is a term generally used for a very bright Giant Star. The term is not precisely defined, but some general characteristics are:

-3 to -8 Absolute Magnitude
1000-1000000 x solar Luminosity
30-1000 x solar
.1-5 AU
radius
8-12 x solar mass
3500K-20000K Temperature

Since brightness is the criteria, the radii can overlap with "non-super giant" stars.

Supergiants, can be red or blue, i.e., a very large Red Giant or a very large blue giant, and can be of different Spectral Classes. Qualifications used for some of the brightest:

  • Bright supergiant - brighter than typical.
  • Luminous supergiant - even brighter.
  • Extremely luminous supergiant - brightest of all.

Examples of supergiants:


(star type)
http://en.wikipedia.org/wiki/Supergiant_star

Referenced by:
Betelgeuse
Canopus
Giant Star
Instability Strip
Luminosity Class
Orion
Rigel

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