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Wolf-Rayet star parameters from spectral analyses

Published online by Cambridge University Press:  26 May 2016

Wolf-Rainer Hamann ,
Götz Gräfener  and
Lars Koesterke
Wolf-Rainer Hamann
Affiliation:
Lehrstuhl Astrophysik, Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, BRD
Götz Gräfener
Affiliation:
Lehrstuhl Astrophysik, Institut für Physik, Universität Potsdam, Am Neuen Palais 10, D-14469 Potsdam, BRD
Lars Koesterke
Affiliation:
NASA Goddard Space Flight Center, Greenbelt MD 20771, USA

Abstract

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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.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 198 - 199
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Gräfener, G., Koesterke, L., Hamann, W.-R. 2002, A&A 387, 244.Google Scholar
Hamann, W.-R., Koesterke, L. 1998, A&A 335, 1003.Google Scholar
Torres, A.V., Massey, P. 1987, ApJS 65, 59.CrossRefGoogle Scholar