Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193..651n&link_type=abstract
Astrophysical Journal, vol. 193, Nov. 1, 1974, pt. 1, p. 651-676.
Astronomy and Astrophysics
Astrophysics
35
Atomic Energy Levels, Line Spectra, Numerical Integration, Radiative Transfer, Stellar Atmospheres, Stellar Spectra, Atmospheric Temperature, Boundary Conditions, Boundary Value Problems, Doppler Effect, Light Scattering, Matrix Theory, Optical Thickness
Scientific paper
We have solved the radiative transfer problem for a two-level atom in plane-parallel geometry in an expanding atmosphere with Schuster-type boundary conditions, by applying the Feautrier method in the fluid rest frame. The line profiles are relatively smooth and very approximately symmetric about their minima, except when the temperature in the atmosphere exceeds that of the photosphere, in which case a redward emission wing appears. Radiation pressure is evaluated and is found to compress the inner part of the atmosphere and to expand the outer part. This suggests that radiation pressure will disrupt QSO absorption clouds, as found by Williams for nonexpanding clouds. The method is stable, accurate, and fast for all optical depths and expansion rates tested, which comprise a vast range.
Noerdlinger Peter D.
Rybicki George B.
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