Line profiles from moving spherical shells

Details Line profiles from moving spherical shells Line profiles from moving spherical shells

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..319b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 319-323.

Astronomy and Astrophysics

Astrophysics

9

Line Shape, Radiative Transfer, Stellar Atmospheres, Stellar Envelopes, Stellar Models, Optical Thickness, Spectral Line Width, Velocity Distribution

Scientific paper

Spherically symmetric moving shells that surround stars create very different spectral line profiles, depending on the local line width, the velocity gradient, and the emitting layer's geometrical extension and optical thickness. Analytical formulae are given for deriving the main profile characteristics in several limiting cases. An investigation follows of the conditions required for a transition from a quasi-rectangular or parabolic profile to a bi-triangular (saw-toothed) profile with a flux minimum at line center.

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