\ abstract

Wolf-Rayet star parameters from spectral analyses

W.-R. Hamann1, G. Gräfener1 and L. Koesterke 2

1Universität Potsdam, Institut für Physik, Lehrstuhl Astrophysik, Germany
2Goddard Space Flight Center, Greenbelt MD, USA

The Potsdam Non-LTE code for expanding atmospheres, which accounts for clumping and iron-line blanketing, has been used to establish a grid of model atmospheres for WC stars. A parameter degeneracy is discovered for early-type WC models which do not depend on the "stellar temperature". 15 galactic WC4-7 stars are analyzed, showing a very uniform carbon abundance (He:C=55:40) with only few exceptions.

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