Article (Scientific journals)
A generalized method for deriving mass-loss rates - The first order moment of unsaturated P Cygni line profiles
Surdej, Jean
1983In Astrophysics and Space Science, 90, p. 299-311
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Keywords :
LINE SPECTRA; STELLAR ENVELOPES; STELLAR MASS EJECTION; STELLAR MOTIONS; STELLAR SPECTRA; NUMERICAL INTEGRATION; OPTICAL THICKNESS; RADIAL VELOCITY; B STARS
Abstract :
[en] For the case of optically thin lines, we show that the relation existing between the first order moment W1 ~ j (E(2)/E~ - 1)(2 - 212) d2 of a P Cygni profile and the quantity ii~in(1eve1), where M is the mass-loss rate of the central star and n(level) the fractional abundance of the ion under study, is in fact independent of any Sobolev-type approximations used for the transfer of line radiation, contrary to what has been assumed in some previous works (Castor eta!., 1981; Surdej, 1982). Consequently, all results established in the context of'very rapidly' expanding atmospheres and mainly referring to the non-dependence of W1 vs various physical (underlying photospheric absorption line, limb darkening, etc.) and geometrical (velocity field v(r), etc.) effects remain unchanged for arbitrary (e.g. non-Sobolev type) outward-accelerating velocity laws. Whenever applied with caution, Equation (50) thus provides a very powerful means of deriving mass-loss rates - with a total uncertainty less than 60 percent - from the measurement W1 of unsaturated P Cygni profiles observed in the spectrum of early - as well as late - type stars, quasars, etc
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 :
A generalized method for deriving mass-loss rates - The first order moment of unsaturated P Cygni line profiles
Publication date :
February 1983
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
90
Pages :
299-311
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 September 2009

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