Astrophysics (index)

Giant Star

(star larger than main sequence stars)

A Giant Star is a star larger than a Main Sequence Star. After the main sequence, stars go through phases where they become giants, e.g., Red Giant or a star on the Asymptotic Giant Branch.

The name originally applied to especially bright stars, i.e., a large Luminosity or Absolute Magnitude. Because the brightness is directly related to the area facing us (the square of the radius), the brightest stars are indeed large. The general term Dwarf Star actually applies to any star that is not a giant, though it is now usually used with a qualifier, with a more specific meaning (White Dwarf, Red Dwarf, Brown Dwarf).

(star type)

Referenced by:
H-R Diagram (HRD)
Instability Strip
Isothermal Core
Stellar Age Determination
Stellar Core
Surface Gravity