The nth order moment W(n)D of a resonance doublet P Cygni line profile

Details The nth order moment W(n)D of a resonance doublet P Cygni line profile The nth order moment W(n)D of a resonance doublet P Cygni line profile

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..141s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 141-152.

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Missing Mass (Astrophysics), Radiative Transfer, Sobolev Space, Stellar Mass, Abundance, Computational Astrophysics, Method Of Moments, Resonance Lines, Velocity Distribution

Scientific paper

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.

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