subgiant
Sign in to saveA subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as giant stars. The term subgiant is applied both to a particular spectral luminosity class and to a stage in the evolution of a star.
Article
13 sectionsContents
- Yerkes luminosity class IV
- Subgiant branch
- Very-low-mass stars
- 0.4 to 0.9
- Mass 1 to 8
- Massive stars
- Properties
- Subgiants in the H–R diagram
- Variability
- Planets
- References
- Bibliography
- External links
A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as giant stars. The term subgiant is applied both to a particular spectral luminosity class and to a stage in the evolution of a star.
==Yerkes luminosity class IV== The term subgiant was first used in 1930 for class G and early K stars with absolute magnitudes between +2.5 and +4. These were noted as being part of a continuum of stars between obvious main-sequence stars such as the Sun and obvious giant stars such as Aldebaran, although less numerous than either the main sequence or the giant stars.