Spectral analyses of WC stars in the LMC

G. Gräfener, W.-R. Hamann and L. Koesterke

Universität Potsdam, Institut für Physik, Lehrstuhl Astrophysik Postfach 601553, D-14415 Potsdam, Germany

Spectra of seven WC stars in the LMC are taken with the Faint Object Spectrograph (FOS) on board the Hubble Space Telescope (HST). They are analyzed by means of non-LTE models for spherically expanding atmospheres with complex model atoms of helium, carbon and oxygen taken into account. We find stellar luminosities in the range from 1056 Lsun to 105.6Lsun. The stellar temperature T*, defined as the effective temperature related to the stellar core radius, is of the order of 100 kK. The atmospheric compositions show carbon mass fractions of about 0.4 and oxygen mass fractions in the range 0.1-0.5.

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