Astrophysics (index)about


(slightly larger than normal star)

A subgiant star is slightly brighter than a normal main sequence star but not as bright as a giant star. They are generally slightly more than solar mass. Many are believed to be stars that ceased to fuse hydrogen in the core, began to collapse, then began fusing hydrogen in the shell.

(star type)

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