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Astron. Astrophys. 318, 543-547 (1997)

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Research Note

B 517 - Another very late WNL star in M 33 *

P.A. , Crowther 1, Th. , Szeifert 2, O. Stahl 2 and F.-J. Zickgraf 3

1 Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT, London, UK
2 Landessternwarte Königstuhl, D-69117 Heidelberg, Germany
3 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstr., Postfach 1603, D-85740 Garching, Germany

Received 9 May 1996 / Accepted 20 June 1996

Abstract

We present intermediate dispersion optical spectroscopy of the M 33 star B 517 (Humphreys & Sandage 1980) obtained at the 3.5m Calar Alto and 4.2m William Herschel Telescopes. Our data reveal a spectral type of WN11h, closely resembling the Galactic LBV candidate He 3-519 (Smith et al. 1994). We find that B 517 is the WNL star observed by Esteban et al. (1994), named MC 70 therein, and present a spectral analysis using the Hillier (1990) iterative scheme. We find that its stellar parameters ([FORMULA] =27kK, log [FORMULA] =5.74, log M / [FORMULA] yr-1 =-4.3, [FORMULA] =275 km s-1) are similar to LMC WN11 stars (Crowther & Smith 1996), with a higher helium content (H/He [FORMULA] 0.8 by number), suggesting a post-LBV evolutionary status.

Key words: stars: Wolf-Rayet – galaxies: individual: M 33 – stars: individual: B 517 (M 33) – galaxies: stellar content

* Based on observations collected at the Calar Alto and William Herschel Telescopes, Spain

Send offprint requests to: P.A. Crowther (pac@star.ucl.ac.uk)

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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