Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..314h&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. 314-318.
Physics
3
Atomic Excitations, Kinetic Equations, Monatomic Gases, Particle Diffusion, Radiative Transfer, Stellar Atmospheres, Atmospheric Diffusion, Atmospheric Models, Atmospheric Physics, Atomic Collisions, Nonequilibrium Thermodynamics, Thermodynamic Equilibrium, Velocity Distribution
Scientific paper
The importance of diffusion transport of excited atoms due to density gradients generated by non-LTE line transfer is discussed. Such kinetic effects are shown to be almost never important under stellar atmospheric conditions, contrary to the previous study by Oxenius (1979). The reasoning behind the different conclusions is discussed. Although Oxenius considered the elastic mean free path as a basic quantity, the present study gives the appropriate basic quantity as the total mean free path of the excited atoms. Changes of global quantities are also taken into account, and an equation is derived which estimates whether kinetic effects are important for an arbitrary line in a parameterized atmosphere. Finally, the problem of the non-LTE line formation can be reduced to the original steady-state formulation of Oxenius (1965).
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