A&A 379, 224-228 (2001)
DOI: 10.1051/0004-6361:20011291

Line-profile variability in the Wolf-Rayet stars WR 135 and WR 111

L. Koesterke¹, W.-R. Hamann¹ and T. Urrutia<sup>1, 2

1</sup>  Professur Astrophysik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
²  Astrophysikalisches Institut Potsdam, 14482 Potsdam, Germany

(Received 27 June 2001 / Accepted 7 September 2001)

Abstract
We have obtained time-resolved observations of line-profile variations of the two Wolf-Rayet stars WR 135 and WR 111. The spectra, taken during two consecutive nights, cover a broad range from 4470 to 6590 Å. The profile variability of the CIII emission line at 5696 Åin WR 135 is shown in detail. The principal difficulties to constrain the velocity law from the frequency drift of discrete spectral features is discussed, emphasizing the crucial dependence on the adopted location of the line-emission region, and the possible necessity to distinguish between the motion of structures and the flow of the matter. -Full access to the observational data is provided via anonymous file transfer.

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

Offprint request: L. Koesterke, lars@astro.physik.uni-potsdam.de

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