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A bright giant is a star intermediate between a giant star and a supergiant in luminosity and spectrum. They span the entire spectral classification; red bright giants tend to be large, like normal red giants, while blue bright giants are often smaller, though still several times the radius of the Sun. On an H-R diagram, bright giants are visible just above the giant branch.

Bright giants evolve to supergiants if they are massive enough, or progress to later stages of stellar evolution like the asymptotic giant branch otherwise.

OldRedStar



Stellar Luminosity Classes
-1 · 0 · I · II · III · IV · V · VI · VII
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