3-D radiative line transfer for be star envelopes |
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Authors: | W. Hummel |
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Affiliation: | (1) Astronomisches Institut, Ruhr-Universität Bochum, Postfach 10 21 48, W-4630 Bochum 1, Germany |
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Abstract: | Based on numerical three-dimensional radiative line transfer calculations H emission line profiles of circumstellar Be star envelopes have been derived. The results show that the socalled winebottle-type emission line profiles can be explained by the combination of rotational broadening and non-coherent scattering in optically thick Keplerian disks. In a further calculation the stellar wind model of Be star envelopes has been re-investigated assuming an additional expansion component in the velocity field. The resulting asymmetric winebottle-type profiles and asymmetric shell-type emission lines with blue-shifted central depressions are in contradiction with the observed line shapes. It is concluded that isotropic stationary outflows are not suitable to explain observed asymmetric emission line profiles of Be stars. |
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Keywords: | Be stars line transfer emission lines |
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