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Tycho G is the surviving binary companion star of the SN 1572 supernova event. The star is located about 7500 light-years away in the constellation Cassiopeia. It is a subgiant, similar to our Sun in luminosity and color but more evolved. Tycho G is still close to the center of the supernova remnant and had triggered once the explosion of its binary companion white dwarf star by contributing mass to it. ==Evidence for companion hypothesis== * Tycho G is traveling at a rate of 136 km/s, which is more than four times faster than the mean velocity of other stars in its stellar neighbourhood. * Tycho G's metallicity is about 3 times higher than the mean metallicity of other stars in its stellar neighbourhood. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tycho G」の詳細全文を読む スポンサード リンク
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