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| dec=〔 | appmag_v=5.71 (var) | constell=Corona Borealis }} R Coronae Borealis is a peculiar low-mass yellow supergiant star, and is the prototype of the rare RCB class of variable stars, which fade by several magnitudes at irregular intervals. R Coronae Borealis itself normally shines at approximately magnitude 6, just about visible to the naked eye, in the constellation of Corona Borealis, but at intervals of several months to many years fades to as faint as magnitude 14. Over successive months it gradually returns to its normal brightness, giving it the nickname "Fade-Out star," or "Reverse Nova". ==History== The variability of R CrB was discovered by the English astronomer Edward Pigott in 1795. It was known as ''Variabilis Coronae'', "Variable of Corona". In 1935 it was the first star shown to have a different chemical composition than the sun via spectral analysis. 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「R Coronae Borealis」の詳細全文を読む スポンサード リンク
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