A hypergiant (luminosity class 0 or Ia+) is a star with an enormous mass and luminosity, showing signs of a very high rate of mass loss. ==Definition== The word `hypergiant` is commonly used as a loose term for the most luminous stars found, even though there are more precise definitions. In 1956, the astronomers Feast and Thackeray used the ter.....
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http://en.wikipedia.org/wiki/Hypergiant
Precise definitions vary, but all agree that hypergiants are the most massive and luminous type of star. They are on the verge of instability with masses of up to about 100 solar masses, strongly developed large-scale atmospheric velocity fields, excessive mass loss, and extended circumstellar envel...
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http://www.daviddarling.info/encyclopedia/H/hypergiant.html
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