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subgiant

(slightly larger than normal star)

A subgiant star is brighter than a normal main sequence star (of the same spectral class) but not as bright as a giant star. They are post main sequence stars undergoing the same type of increased luminosity and radius as a giant star, but less so. They are generally slightly more than solar mass.

Some somewhat-low mass stars (e.g., the Sun) have a phase in their stellar evolution when they fit this fit this category. The phase, termed the subgiant branch (SGB), is their time transitioning from the main sequence to the red-giant branch.


(star type,stellar evolution)
http://en.wikipedia.org/wiki/Subgiant
https://www.astro.princeton.edu/~burrows/classes/403/stages.pdf

Referenced by:
giant star
horizontal branch (HB)
luminosity class
red-giant branch (RGB)

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