Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.216...87h&link_type=abstract
Astrophysics and Space Science, vol. 216, no. 1-2, p. 87-91
Astronomy and Astrophysics
Astrophysics
1
Emission Spectra, H Alpha Line, Plasma Jets, Radiative Transfer, Stellar Envelopes, Stellar Models, Stellar Spectra, Stellar Winds, Astronomical Spectroscopy, Kepler Laws, Optical Thickness
Scientific paper
Based on numerical three-dimensional radiative line transfer calculations H-alpha emission line profiles of circumstellar Be star envelopes have been derived. The results show that the so-called 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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