Analyses of Wolf-Rayet ultraviolet spectra |
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| Authors: | Krzysztof Rochowicz |
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| Institution: | (1) Institute of Astronomy, ul. Chopina 12/18, PL-87-100 Torun, Poland |
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| Abstract: | Ultraviolet spectra of population I WR stars obtained from IUE archive are used to determine fundamental stellar parameters. Terminal velocities for 85 galactic and LMC Wolf-Rayet stars were obtained by means of the empirical relation between spectral quantities easily measured in low resolution and high-resolution terminal velocity measurements. Temperatures and so-called transformed radii were derived based on available contour plots of spectral characteristics for a grid of NLTE models. The effect of the reddening law on stellar far ultraviolet continua is emphasized and the revised extinction curve towards WR stars is used for dereddening. For the sample of stars attributed to open clusters or associations we construct the stellar distance scale and adopt it for the other WR stars. The remaining fundamental parameters are derived and HR diagram for population I WR stars is presented. |
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| Keywords: | stars: Wolf-Rayet stars: atmospheres stars: fundamental parameters |
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