Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76..312o&link_type=abstract
Astronomy and Astrophysics, vol. 76, no. 3, July 1979, p. 312-317.
Astronomy and Astrophysics
Astrophysics
7
Atomic Excitations, Convective Flow, Line Spectra, Radiative Transfer, Stellar Atmospheres, Atomic Collisions, Diffusion Theory, Elastic Scattering, Helium, Hydrogen, Kinetic Equations, Thermodynamic Equilibrium
Scientific paper
Convective transport of excited atoms in a homogeneous medium containing two-level atoms is considered. This physical effect necessarily occurs whenever radiative line transfer takes place in non-LTE situations, in astrophysical as well as laboratory plasmas. It is argued that, in physical terms, neglecting this effect is tantamount to using a model in which particle number is not conserved. Evidence is given to show that a diffusion model for convective transport of excited atoms has rather limited applicability since, in a diffusion regime, the diffusion flow usually has a negligible effect on non-LTE-line transfer. It is suggested on physical grounds that solutions to the non-LTE line-transfer problem in the case of a kinetic regime should depend rather sensitively on the boundary conditions imposed on the excited-atom gas.
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