Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..80..437p&link_type=abstract
Astrophysics and Space Science, vol. 80, no. 2, Dec. 1981, p. 437-442.
Astronomy and Astrophysics
Astrophysics
2
Atomic Energy Levels, Distribution Functions, Radiative Transfer, Resonance Lines, Stellar Atmospheres, Equilibrium Equations, Frequency Distribution, Gas Dynamics, Iterative Solution, Statistical Analysis
Scientific paper
A simultaneous solution of the statistical equilibrium equation for a non-LTE two-level atom and the radiative transfer equation in the comoving frames is obtained by employing the angle-averaged partial frequency redistribution with isotropic scattering. The population density of the upper level is set equal to zero in the first iteration, and it is allowed to be populated in the subsequent iterations. The solution converges within two to four iterations, and the process is terminated when the ratios of population densities in the two successive iterations attain an accuracy of 1%. Partial frequency redistribution tends to increase the population density of the upper level, and radial gas motions do not appear to have significant effect.
Peraiah Annamaneni
Rao Madhusudana D.
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