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27 Cygni
27 Cygni is a star in the constellation Cygnus. Its apparent magnitude is 5.36. Located around distant, it is a K-type subgiant of spectral type K0IV, a star that has used up its core hydrogen and is starting to expand. The star is an RS Canum Venaticorum variable,〔 meaning that it is a close binary star whose components have star-spots, which cause variations in brightness. ==References==
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「27 Cygni」の詳細全文を読む
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