Reference : Determination of mass-loss rates from the first order moment W1 of unsaturated Cygni lin...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/22113
Determination of mass-loss rates from the first order moment W1 of unsaturated Cygni line profiles
English
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Nov-1982
Astrophysics & Space Science
Springer Science & Business Media B.V.
88
31-54
Yes (verified by ORBi)
International
0004-640X
Dordrecht
The Netherlands
[en] SPECTRAL LINE WIDTH ; STELLAR MASS EJECTION ; ABSORPTION SPECTRA ; ABUNDANCE ; APPROXIMATION ; LINE SPECTRA ; PHOTONS ; PHOTOSPHERE ; STELLAR ROTATION ; EARLY STARS
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/22113
10.1007/BF00648988
http://esoads.eso.org/abs/1982Ap%26SS..88...31S
The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization. The original publication is available at www.springerlink.com.

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