Article (Scientific journals)
Determination of mass-loss rates from the first order moment W1 of unsaturated Cygni line profiles
Surdej, Jean
1982In Astrophysics and Space Science, 88, p. 31-54
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Keywords :
SPECTRAL LINE WIDTH; STELLAR MASS EJECTION; ABSORPTION SPECTRA; ABUNDANCE; APPROXIMATION; LINE SPECTRA; PHOTONS; PHOTOSPHERE; STELLAR ROTATION; EARLY STARS
Abstract :
[en] The relationship between the first order moment and the mass loss rate is investigated within the framework of the Sobolev approximation (1947, 1957, 1958) under various physical and geometrical conditions. By assuming that the size of the expanding envelope from which the observed P Cygni profiles arise is large with respect to the central stellar core, a general expression for the n-th order moment is obtained for the case of a point-like source in terms of the usual parameters inherent to Sobolev-type theories. It is then shown how the first result is altered when considering separately the effects due to collisions and rotation, the presence of the underlying photospheric absorption line, the finite size of the central core, and the limb-darkening of the stellar core. It is concluded that the total uncertainty of the mass loss rate determination made with the approach proposed here should be less than 60 percent.
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 :
Determination of mass-loss rates from the first order moment W1 of unsaturated Cygni line profiles
Publication date :
November 1982
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
88
Pages :
31-54
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 September 2009

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