A subgiant star is a star that is slightly brighter than a normal main-sequence (dwarf) star of the same spectral class, but not as bright as true giant stars. Although certain subgiants appear to be simply unusually bright metal-rich hydrogen-fusing stars (in the same way subdwarfs are unusually dim metal-poor hydrogen-fusing stars), they are gen...
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Structure of a subgiant A star that has stopped fusing hydrogen in its core and has begun to evolve off the main sequence, increasing in size and luminosity, on its way to becoming a red giant. Subgiants produce energy in a hydrogen-burning shell that surrounds the core. They are mainly of type...
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