Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66...45s&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 45-55.
Physics
6
Atomic Energy Levels, Radiative Transfer, Stellar Envelopes, Stellar Spectra, Acceleration (Physics), Emission Spectra, Equilibrium Equations, Graphs (Charts), Radial Velocity
Scientific paper
The escape probability method developed by Sobolev (1947) is applied to the case of a two-level atom. The numerical applications are based on a previous work concerning a general theory of spectral-line formation in outward-accelerating and outward-decelerating stellar envelopes. Only the radiative exchanges occurring between the atomic levels are considered, and the statistical-equilibrium equations are solved rigorously in the cases of a transparent medium at rest, an outward-accelerating envelope, and an outward-decelerating envelope. The population of the atomic levels are compared for different physical conditions in each case. It is shown numerically that in the case of an outward-decelerating envelope the contribution of distant atoms to the mean intensity of line radiation appreciably enhances the degree of excitation throughout the envelope.
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