Astrophysics (Index)About


(slightly larger than normal star)

A subgiant star is brighter than a normal main sequence star of the same spectral type, 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)
Further reading:

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