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subgiant
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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.
Wikidata facts
- Subclass of
- giant star
- Part of
- Hertzsprung–Russell diagram
- Followed by
- red giant branch
- Follows
- main sequence
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- topic's main category
- Category:Subgiant stars
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- Subgiant stars
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Encyclopedic overview
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.
Excerpted from Wikipedia’s “subgiant” article, available under the CC BY-SA 4.0 licence.