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A subgiant is a type of star with a luminosity (and generally size) in between that of a main sequence star and that of a giant star[1]. Subgiants fuse hydrogen in a shell near their outer layers, as they have depleted all of the hydrogens at their cores. On an H-R diagram, the subgiant branch is visible as a bent stripe slightly above the main sequence.

Low-mass stars do not develop into subgiants, but more massive stars spend varying amounts of time at this stage; generally, the more massive the star, the quicker it passes through the subgiant stage. After this, stars evolve into giants or supergiants.

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

References Edit

  1. https://en.wikipedia.org/wiki/Subgiant
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