MISSING MASS (ASTROPHYSICS); RADIATIVE TRANSFER; SOBOLEV SPACE; STELLAR MASS; ABUNDANCE; COMPUTATIONAL ASTROPHYSICS; METHOD OF MOMENTS; RESONANCE LINES; VELOCITY DISTRIBUTION
Abstract :
[en] The theory of the nth order moment W(n)D of a P Cygni line profile due to a resonance doublet line transition is developed here in the framework of the Sobolev approximation. It is shown that, in the optically thick approximation, the asymptotic value W(n)D,t is entirely dependent on both the doublet separation and the type of the velocity field characterizing the expanding atmosphere. The most useful P Cygni profiles seem to be those which are unsaturated.
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)
Hutsemekers, Damien ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
The nth order moment W(n)D of a resonance doublet P Cygni line profile