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分类:Main Sequence G-type
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{{等待翻译|翻译者=}} A '''G-type main-sequence star''' (Spectral type: G-V), also often, and imprecisely called a '''yellow dwarf''', or '''G star,''' is a [[Main sequence star|main sequence]] star of [[spectral type]] G and [[luminosity class]] V. Such a star has about 0.9 to 1.1 solar masses and an effective temperature between about 5,300 and 6,000 K. Like other main-sequence stars, a G-type main-sequence star is converting the element [[hydrogen]] to [[helium]] in its core by means of nuclear fusion, but can also fuse helium when hydrogen runs out. [[Sol]], the star in the center of the [[Sol system|Solar system]] to which the [[Earth]] is gravitationally bound, is an example of a G-type main-sequence star (G2V type). Each second, the Sun fuses approximately 600 million tons of hydrogen into helium in a process known as the proton–proton chain (4 hydrogens form 1 helium), converting about 4 million tons of matter to energy. Besides the Sun, other well-known examples of G-type main-sequence stars include Alpha Centauri, Tau Ceti, Capella and 51 Pegasi. {{DPLCat Astronomical Objects|Main Sequence G-type}} [[Category:Stars]] [[en:/Category:Main_Sequence_G-type]]
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