Abstract
In the framework of the Sobolev approximation, we investigate the effects of limb darkening of the stellar core onto the formation of line profiles in rapidly expanding envelopes.
For the case of outward-accelerating envelopes, it is shown that the P Cygni profiles, calculated with and without limb darkening, do appear almost identical as long as the size of the envelope remains large with respect to the radius of the star. As the extent of the envelope decreases, the resulting profiles are found to differ appreciably close to the line center.
When considering outward-decelerating (or equivalently inward-accelerating) envelopes, calculations with the limb darkening effects reveal that the P Cygni profiles are more strongly affected than in the previous case. These effects are specially important in the blue wing and near the center of the resulting line profiles, irrespective of the size of the envelope.
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Chargé de Recherches au Fonds National de la Recherche Scientifique, Belgium.
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Surdej, J. Formation of P Cygni profiles with limb darkening of the stellar core. Astrophys Space Sci 79, 213–227 (1981). https://doi.org/10.1007/BF00655918
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DOI: https://doi.org/10.1007/BF00655918