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Paper: On the use of H-alpha and He II 4686 as mass-loss and luminosity indicators for hot stars
Volume: 7, Properties of Hot Luminous Stars: Boulder-Munich Workshop
Page: 218
Authors: Gabler, Astrid; Gabler, Rudolf; Pauldrach, Adalbert; Puls, Joachim; Kudritzki, Rolf-Peter
Abstract: By the example of a typical O4 f star like Zeta Pup, the applicability of H-alpha and He II 4686 for the determination of mass-loss rates is demonstrated. The comparison of unified model atmosphere calculation to earlier work shows that the approximations concerning the atmosphere and the radiation transport made there can lead to large errors, especially in the case of high or low mass loss rates. It is, therefore, preferable to use the present calculations directly for the mass-loss determination from observed equivalent widths of H-alpha and He II 4686. Furthermore, the He II 6560 blend is taken correctly into account in the profile calculation of H-alpha, which has an effect of 0.2 dex in the resulting mass-loss rate for Zeta Pup.
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