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W Mensae (W Men) is an unusual yellow supergiant star in the Large Magellanic Cloud in the southern constellation Mensa. It is an R Coronae Borealis variable and periodically decreases in brightness by several magnitudes. W Men is very distant, being located in the neighboring galaxy Large Magellanic Cloud, where it lies on the southern metal-deficient edge. Despite its high luminosity, the star has a maximum apparent brightness of +13.8m, too dim to be visible in a small telescope. Its radius has been calculated to be 61 times that of the Sun.

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  • W Mensae (fr)
  • W Mensae (en)
  • W Mensae (sv)
  • 山案座W (zh)
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  • W Mensae (en abrégé W Men) est une étoile supergéante jaune du Grand Nuage de Magellan située dans la direction de la constellation de la Table. Il s'agit d'une étoile variable de type R Coronae Borealis dont la luminosité décroit périodiquement de plusieurs magnitudes. (fr)
  • W Mensae är en eruptiv variabel av RCB-typ (RCB) i stjärnbilden Taffelberget. W Mensae finns på 168 000 ljusårs avstånd, i granngalaxen Stora magellanska molnet. Trots stjärnans stora luminositet är stjärnan på grund av det stora avståndet bara av magnitud +13,4. I förmörkelsefasen når den ner under 18,3. Variabeln upptäcktes 1927 av den holländsk-amerikanske astronomen Willem Jacob Luyten. (sv)
  • 山案座W (W Men)是在南天山案座大麥哲倫星系內一顆不尋常的黃超巨星。它是一顆北冕座R型變星,光度會週期性的降低好幾個星等。 山案座W位於鄰近的大麥哲倫星系南邊缺乏金屬的邊緣地區,距離地球很遠。儘管它有很高的亮度,但它最亮時的視星等只有+13.8m,對小望遠鏡來說是太黯淡了。依據計算得知它的半徑是太陽的61倍。 山案座W的變異性質是在1927年發現的。它屬於非常罕見的北冕座R型變星,這一類變星的光度偶爾會有非常大幅的下降,因此通常被稱為「逆新星」。山案座W的光度最低時的照相藍星等會低於+18.3等,以致於在當時的趙相乾版上檢測不到。在長波的觀測下,亮度的下降並不明顯,因此認為恆星整體的亮度沒有太大的變化。這樣的變化是由塵埃引起的,是塵埃暫時遮擋了恆星。可見光的短波被吸收後,會以紅外線再輻射出來。許多北冕座R型變星顯示出小振幅的脈動,山案座W的脈動周期約為67天。 (zh)
  • W Mensae (W Men) is an unusual yellow supergiant star in the Large Magellanic Cloud in the southern constellation Mensa. It is an R Coronae Borealis variable and periodically decreases in brightness by several magnitudes. W Men is very distant, being located in the neighboring galaxy Large Magellanic Cloud, where it lies on the southern metal-deficient edge. Despite its high luminosity, the star has a maximum apparent brightness of +13.8m, too dim to be visible in a small telescope. Its radius has been calculated to be 61 times that of the Sun. (en)
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  • W Mensae (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/WMenLightCurve.png
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dist ly
  • ~168,000 (en)
absmag v
  • −4.8 (en)
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appmag 2 passband
  • R (en)
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