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Discovery of a new Wolf-Rayet star using SAGE-LMC

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arxiv 1110.0126 v2 pith:N5YNSXVA submitted 2011-10-01 astro-ph.SR

V.V. Gvaramadze (1) , A.-N. Chené (2 , 3) , A.Y. Kniazev (4 , 1) , O. Schnurr (5) ((1) Sternberg Astronomical Institute , Moscow State University , Russia
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(2) Departamento de Astronomia Univ. de Concepcion Chile (3) Univ. de Valparaiso Departamento de Fisica y Astronomia (4) South African Astronomical Observatory Southern African Large Telescope Foundation South Africa (5) AIP An der Sternwarte Germany)
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keywords starcircumstellarclouddiscoverylargemagellanicsage-lmcshell
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We report the first-ever discovery of an extragalactic Wolf-Rayet (WR)star with Spitzer. A new WR star in the Large Magellanic Cloud (LMC) was revealed via detection of its circumstellar shell using 24 {\mu}m images obtained in the framework of the Spitzer Survey of the Large Magellanic Cloud (SAGE-LMC). Subsequent spectroscopic bservations with the Gemini South resolved the central star in two components, one of which is a WN3b+abs star, while the second one is a B0V star. We consider the lopsided brightness distribution over the circumstellar shell as an indication that the WR star is a runaway and use this interpretation to identify a possible parent cluster of the star.

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