Category:Hertzsprung–Russell classifications From Wikipedia, the free encyclopedia Hertzsprung–Russell diagram Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence("dwarfs") Subgiants Giants Red giants Blue giants Bright giants Supergiants Red supergiant Hypergiants absolutemagni-tude(MV) Wikimedia Commons has media related to Hertzsprung–Russell diagram. Related Articles