Article (Scientific journals)
Analysis of P Cygni line profiles - Generalization of the nth order moment WN
Surdej, Jean
1985In Astronomy and Astrophysics, 152, p. 361-370
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Keywords :
STELLAR ATMOSPHERES; STELLAR MASS EJECTION; STELLAR MODELS; STELLAR PHYSICS; VELOCITY DISTRIBUTION; LINE SPECTRA; MASS TRANSFER; OPACITY; QUASARS; SPECTRAL LINE WIDTH
Abstract :
[en] The generalization of the nth order moment W[SUB]n[/SUB] of a P Cygni line profile leads to a new approach of deriving the various physical quantities which characterize the phenomenon of mass-loss around stars, quasars, etc. Adopting realistic expressions for the velocity and opacity distributions the author presents and discusses the results of calculations of the moments W[SUB]n[/SUB] in two types of different diagrams: the "log (W[SUB]n[/SUB])-log(W[SUB]n[/SUB][SUP]0[/SUP])" and "log(W[SUB]n[/SUB])-log (W[SUB]0[/SUB])" diagrams. The physical representation of the parameters W[SUB]n[/SUB][SUP]0[/SUP] is then given and the author tests and generalizes the validity of some of the linear relations W[SUB]n[/SUB] â W[SUB]n[/SUB][SUP]0[/SUP] for the case of slowly expanding optically thin atmospheres.
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 :
Analysis of P Cygni line profiles - Generalization of the nth order moment WN
Publication date :
1985
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
152
Pages :
361-370
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 August 2009

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