Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..200k&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 200-205.
Astronomy and Astrophysics
Astrophysics
Atmospheric Ionization, Radiative Transfer, Stellar Atmospheres, Thermodynamic Equilibrium, Far Ultraviolet Radiation, Particle Density (Concentration), Photoionization
Scientific paper
A static atmosphere with only Lyman continuum radiation in radiative equilibrium is studied for the effects of radiative and collisional ionization on deviations from local thermodynamic equilibrium (LTE). Large increases and decreases of the kinetic temperature (range in T of about factor 2) and, correspondingly, very large over- and underpopulation of the bound state (range in b of about factor 1,000,000) are found, depending on the frequency dependence of the photoionization cross section. Despite these large deviations from LTE, which strongly modify the emergent spectrum, there is almost no effect on the particle densities, the degree of ionization, and the basic structure of the atmosphere.
Kalkofen Wolfgang
Klein Richard I.
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