Reference : Contribution to spectral line formation in moving stellar envelopes - Radiation field...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/17731
Contribution to spectral line formation in moving stellar envelopes - Radiation field and statistical equilibrium equations
English
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
1977
Astronomy and Astrophysics
EDP Sciences
60
303-311
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] RADIATIVE TRANSFER ; STELLAR ENVELOPES ; STELLAR MOTIONS ; STELLAR SPECTRA ; GRADIENTS ; LINE SPECTRA ; PROBABILITY DISTRIBUTION FUNCTIONS ; VELOCITY DISTRIBUTION ; LINE SHAPE
[en] The escape probability method introduced by Sobolev (1947) is used to derive the mean intensity of the radiation field at any point of an envelope which expands spherically with a positive or negative radial-velocity gradient. When considering outward-decelerating envelopes, an additional contribution to the mean intensity of the radiation field must be taken into account when compared with the results obtained by Castor (1970) in the case of outward-accelerating envelopes. A general discussion of the net radiative rates which populate the levels of an atom relates the problem of spectral-line formation in a moving medium to the one in a transparent atmosphere at rest. Namely, it is shown that dilution effects are expected to play an important role in envelopes where very large velocity gradients occur.
Researchers ; Professionals
http://hdl.handle.net/2268/17731
http://esoads.eso.org/abs/1977A%26A....60..303S
The authors thank EDP Sciences for their deposit authorization

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