red giant

A red giant is a luminous giant star of low or intermediate mass that is in a later phase of its evolution, with nuclear fusion going on in a shell outside the core but not in the core itself. The core matter is electron degenerate and extremely compressed, so the outer atmosphere is inflated and tenuous, making the radius immense and the surface temperature low, somewhere from 5,000 K and lower. The appearance of the red giant is from yellow orange to red, including the spectral types K and M, but also class S stars and most carbon stars.
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Noun
1. a large cool star; has a relatively low surface temperature and a diameter large relative to the sun
(synonym) red giant star
(hypernym) star

Any star which is burning helium in its core and has a spectral classification of K or M. See diagramatic sequence.

red giant
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