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Astron. Astrophys. 341, 211-215 (1999)

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Observational constraints on the efficiency of acceleration in the optically thin parts of Wolf-Rayet winds

S.V. Marchenko 1,2 and A.F.J. Moffat 1,2

1 Département de Physique, Université de Montréal, C.P. 6128, Succ. "Centre-Ville", Montréal, Qc, H3C 3J7, Canada
2 Observatoire du mont Mégantic (e-mail: sergey; moffat@astro.umontreal.ca)

Received 27 March 1998 / Accepted 29 September 1998

Abstract

Wolf-Rayet stars have such strong winds that their inner regions are optically thick, preventing us from seeing the hydrostatic stellar cores. One might expect considerable acceleration of the wind to occur in the optically thick part. However, we show empirically that at least 50%, and in some cases up to 100%, of the wind's acceleration occurs in the optically thin part of the WR wind.

Key words: stars: mass-loss – stars: Wolf-Rayet

Send offprint requests to: S.V. Marchenko

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© European Southern Observatory (ESO) 1999

Online publication: November 26, 1998
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