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, i.e., 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:

0.96-1.15radius(solar)
0.8-1.4mass(solar)
4.3-5.3absolute magnitude(bolometric)
0.6-1.5bolometric luminosity(solar)
9-18 billion yearsmain-sequence lifetime
7.6%abundance

Giant stars can also fall in the G-class. Other example G-type stars are Alpha Centauri and T Tauri (a pre-main-sequence star).


(star type,spectral class)
Further reading:
https://en.wikipedia.org/wiki/Stellar_classification#Class_G
http://en.wikipedia.org/wiki/G-type_main-sequence_star
WaveLFreqPhoton
Energy
  
387nm775THz3.3eVbeginG-type star
527nm569THz2.4eVendG-type star

Referenced by pages:
calcium (Ca)
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
Kepler-1625b
Kepler-452b
Morgan classification
solar mass (MSun)
multiplicity fraction
RR Lyrae variable (RRL)
spectral class
Sun
Transiting Exoplanet Survey Satellite (TESS)
Wilson-Bappu effect

Index