W Mensae

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. Despite its great luminosity, the star has a maximum apparent brightness of +13.8m,cite web | last = Samus | first = N. N. | coauthors = Durlevich, O. V.; et al. | title = Combined General Catalogue of Variable Stars (GCVS4.2) | date = 2004 | url = http://cdsweb.u-strasbg.fr/viz-bin/Cat?II/250 | accessdate = 2007-01-04 ] 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. [cite journal |last=Luyten |first=W. J. |authorlink=Willem Jacob Luyten |year=1927 |title=A New Irregular Variable of the R Coronae Type |journal=Harvard College Observatory Bulletin |issue=846 |pages=31–33 |id=1927BHarO.846...33L |url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1927BHarO.846...33L |accessdate=2007-01-04 ]

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