Concept information
Preferred term
G stars
Definition
- A member of a class of stars to which the Sun belongs. The G-type stars on the main sequence have surface temperatures of 5,300-6,000 K and therefore appear yellow in color. G type giant stars (such as Capella) are almost 100-500 K colder than the corresponding main sequence stars. G type supergiants have temperatures of 4,500-5,500 K. The spectrum of early type G stars, such as the Sun (G2), is dominated by ionized lines of calcium (H and K lines, mainly) and neutral metals. In later type G stars the molecular bands of CH molecules and CN molecules become visible. The main sequence and giant stars have masses of ~ 1 solar mass, while the supergiants are of ~ 10 solar masses. The luminosities of G-type giants are almost 30-60 times greater than that of the Sun, whereas the supergiants are 10,000-30,000 times more luminous. (en)
Broader concept
Narrower concepts
- G dwarf stars (en)
- G giant stars (en)
- G subdwarf stars (en)
- G subgiant stars (en)
- G supergiant stars (en)
Entry terms
- Class G stars (en)
- G-type stars (en)
Editorial note
URI
http://astrothesaurus.org/uat/558
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