Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..441s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 2/JUL15, P. 441, 1994
Astronomy and Astrophysics
Astronomy
1
Scientific paper
With the availability of very high-resolution stellar spectra, even small differences between line profiles resulting from complete redistribution and partial frequency redistribution may be important in the quantitative analysis of stellar spectra. A differentially expanding and spherically symmetric stellar envelope is considered in order to study the effects of the angle-averaged partial frequency redistribution function R111 on spectral line formation. The line transfer equation is solved in the rest frame of the star, assuming a two-level atomic model. The differences between the emergent mean intensity profiles resulting from complete redistribution and the angle-averaged R111 are found to be much smaller in expanding spherically symmetric stellar atmospheres than has been reported previously for plane-parallel atmospheres. Key words: line: profiles - radiative transfer - stars: atmospheres.
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