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Astron. Astrophys. 347, 556-564 (1999)

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The WC6 Wolf-Rayet star MLA 1159 in M 31 and its ionization nebula BA 1-642

J. Greiner 1, G. Tovmassian 2, S. Komossa 3, M. Rosado 2 and A. Arrieta 2

1 Astrophysical Institute Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
2 Instituto de Astronomía, UNAM, Apdo. Postal 877, 22800 Ensenada, B.C., México
3 Max-Planck-Institute for Extraterrestrial Physics, D-85740 Garching, Germany

Received 22 December 1998 / Accepted 14 April 1999


We report on optical imaging and spectroscopic observations of the Wolf-Rayet candidate star MLA 1159 and the surrounding ionization nebula BA 1-642 in the Andromeda Galaxy. Though both objects have been known for many years, our observations (1) confirm the Wolf-Rayet nature of MLA 1159, (2) allow one to determine the nebula as an ionization nebula, and (3) demonstrate the association of MLA 1159 with the nebula. The supersoft X-ray source RX J0045.5+4206 whose error box encompasses the full nebula, seems to be a chance superposition and not related to MLA 1159 and/or BA 1-642.

Key words: stars: individual: RX J0045.5+4206 – stars: individual: MLA 1159 – stars: Wolf-Rayet – ISM: individual objects: BA 1-642 – ISM: reflection nebulae – galaxies: individual: M 31

Send offprint requests to: J. Greiner (jgreiner@aip.de)

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© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999