Mathematics – Probability
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..267o&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 267-277.
Mathematics
Probability
72
Line Spectra, Radiative Transfer, Resonance Lines, Stellar Spectra, Stellar Winds, B Stars, Escape Velocity, O Stars, Stellar Mass Ejection
Scientific paper
It is noted that when stellar winds have expansion velocities greater than the velocity separation between doublet line transitions, the line source function of the component with the longer wavelength depends on nonlocal values of the other component's source function. Using the Sobolev (1947) approximation and escape probability methods, the nonlocal radiative coupling for the case of spherically symmetric outflow with a monotonically increasing velocity is solved explicitly and efficiently. This case is directly applicable to the doublet P Cygni type profiles observed in the ultraviolet spectra of O and B stars and gives an improved determination of the line strengths. The nonlocal coupling also changes the radiative forces that act on the mass outflow. Examples of the way in which the nonlocal radiative coupling changes the line source function, the line profiles, and the radiative forces are presented.
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