Astrophysics (Index)About

G-type star

(G, G-class star)
(stars spectrally similar to the Sun)

A G-type star is a star within the G-class, a spectral class for stars with metal and weak hydrogen absorption lines, a yellow color and a surface temperature in the range of 5300-6000 K. The spectral energy distribution peak is within the visible range. The Sun is a main sequence star within this class. Such main sequence stars (aka yellow dwarfs or G dwarfs) burn their hydrogen in on the order of ten billion years. Characteristics of G-type main sequence stars:

4.3-5.3absolute magnitude(bolometric)
0.6-1.5bolometric luminosity(solar)
9-18 billion yearsmain-sequence lifetime

Some example G-type stars are Alpha Centauri and T Tauri (a pre-main-sequence star). Giant stars can also fall in the G-class (yellow giants), including supergiants (yellow supergiants) and hypergiants (yellow hypergiants).

(star type,spectral class)
Further reading:
387nm775THz3.3eVbeginG-type star
527nm569THz2.4eVendG-type star

Referenced by pages:
barium star (Ba star)
calcium (Ca)
Earth analog
FGK star
55 Cancri e (55 Cnc e)
51 Pegasi b (51 Peg b)
G band
G-dwarf problem
HD 133131
HD 209458 b
HD 80606 b
Kepler Telescope
Morgan classification
solar mass (MSun)
multiplicity fraction
RR Lyrae variable (RRL)
spectral class
Transiting Exoplanet Survey Satellite (TESS)
Wilson-Bappu effect