Transfer of line radiation in differentially expanding atmospheres. V - Line formation in a decelerating spherical flow

Details Transfer of line radiation in differentially expanding atmospheres. V - Line formation in a decelerating spherical flow Transfer of line radiation in differentially expanding atmospheres. V - Line formation in a decelerating spherical flow

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..247m&link_type=abstract

Astrophysical Journal, Part 1, vol. 215, July 1, 1977, p. 247-264.

Physics

36

Line Spectra, Radiative Transfer, Stellar Atmospheres, Supersonic Flow, Acceleration (Physics), Deceleration, Doppler Effect, Gas Expansion, Resonance

Scientific paper

Radiative transfer and resonance-line formation in expanding, decelerating stellar atmospheres are analyzed in the supersonic approximation, taking spherical geometry into account and assuming complete redistribution over the line profile in the fluid frame. The influence of interlayer radiative coupling is investigated, and cases where the 'disconnected approximation' of Kuan and Kuhi (1975) applies are identified. The radiation force on the atmospheric material is evaluated, the applicability of decelerating atmospheres to real stars is discussed, and the effect of the disconnected approximation is tested by using a program to turn the interlayer radiative coupling on and off at will. Numerical results are presented which show that the value of the source function is not very sensitive to the disconnected approximation except at large radii and that the line profile is very sensitive to the outer cutoff radius. Some cases of accelerating, infalling matter are also considered.

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