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W Mensae
W Mensae (W Men) is a variable star in the southern constellation Mensa. The star is classified as a yellow-white supergiant (spectral class F8 Iab).〔 W Mensae is very distant, being located in the neighboring galaxy Large Magellanic Cloud, where it lies on the southern metal-deficient edge.〔 Despite its great luminosity, the star has a maximum apparent brightness of +13.8m, too dim to be visible even for a small telescope. It belongs to the very rare R Coronae Borealis class of variables〔 which are often called "inverse novae" since they experience once a while very large drops in brightness. W Mensae is not an exception, since at minimum its brightness is less than +18.3m.〔 The variability of the star was discovered in 1927 by W. J. Luyten. Its radius has been calculated to be 61 times that of the Sun.〔 ==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「W Mensae」の詳細全文を読む
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