Line formation in spherical media with partial frequency redistribution. II - Expanding media with redistribution function R sub I

Details Line formation in spherical media with partial frequency redistribution. II - Expanding media with redistribution function R sub I Line formation in spherical media with partial frequency redistribution. II - Expanding media with redistribution function R sub I

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..63..267p&link_type=abstract

Astrophysics and Space Science, vol. 63, no. 2, July 1979, p. 267-277.

Astronomy and Astrophysics

Astrophysics

3

Distribution Functions, Frequency Distribution, Gas Expansion, Line Spectra, Stellar Atmospheres, Stellar Spectra, Computerized Simulation, Gas Dynamics, Radiative Transfer, Wolf-Rayet Stars

Scientific paper

Lines formed in a differentially expanding atmosphere are calculated by using the angle averaged redistribution function RI and compared with those formed by complete redistribution in the observer's frame of reference. An atmosphere is considered whose ratios of inner to outer radii are 2 and 10, and it is assumed that the gas in the atmosphere is expanding uniformly with a maximum velocity of 3 mean thermal units. Lines which are formed in spherical symmetry and those obtained by integrating over the apparent disk are presented with three types of physical situations considered with a 2-level atom and a non-LTE approximation. Noticeable differences are found between profiles formed by partial redistribution (PRD) and complete redistribution (CRD). Profiles integrated over the stellar disk from the first type of medium are box type with a flat top, similar to those observed in WC stars, while those from the second type of medium show emission peaks on the red and blue sides with the emission on the red side larger than on the blue side. Profiles from the third type of medium with pure scattering show some emission on the red side and deep absorption on the blue side. Finally, it is noted that large geometrical extension of the atmosphere and higher gas velocities seem to enhance these two effects.

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