Article (Scientific journals)
Formation of P Cygni profiles with limb darkening of the stellar core
Surdej, Jean
1981In Astrophysics and Space Science, 79, p. 213-227
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Keywords :
LINE SPECTRA; SPECTRAL LINE WIDTH; STELLAR ENVELOPES; ABSORPTION SPECTRA; APPROXIMATION; CYGNUS CONSTELLATION; LIMB DARKENING
Abstract :
[en] In the framework of the Sobolev approximation, the effects of limb darkening of the stellar core on the formation of line profiles in rapidly expanding envelopes are investigated. 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
Formation of P Cygni profiles with limb darkening of the stellar core
Publication date :
September 1981
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
79
Pages :
213-227
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 September 2009

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