
Blue supergiants (BSGs) are hot luminous stars, referred to scientifically as OB supergiants. They have luminosity class I and spectral class B9 or earlier. They are found towards the top left of the Hertzsprung-Russell diagram to the right of the main sequence. They are larger than the sun but smaller than a red supergiant, with surface temperatu...
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http://en.wikipedia.org/wiki/Blue_supergiant

Size comparison of a blue supergiant with the Sun, and the Sun with Jupiter. Image: © Mark A. Garlic, space-art.co.uk A hot, massive, luminous star that is in an advanced post-main sequence stage of evolution. The best known example is Rigel. See supergiant for more details.
Found on
http://www.daviddarling.info/encyclopedia/B/bluesuper.html

A supergiant star with spectral type O or B. See also: Star, Supergiant.
Found on
https://www.encyclo.co.uk/local/20687
No exact match found.