Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..183t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 183-186.
Astronomy and Astrophysics
Astrophysics
5
Atmospheric Stratification, Line Spectra, Nonequilibrium Thermodynamics, Radiative Transfer, Stellar Atmospheres, Thermodynamic Equilibrium, Radiant Cooling
Scientific paper
The question of efficiency of radiative energy losses in spectral lines is addressed. In a semi-infinite atmosphere with constant temperature, the total radiative energy loss (integrated over all depths) in a spectral line without continuum is infinite, in both LTE and non-LTE. Thus, only local energy balances may be considered with such models. The authors give radiative cooling functions for various non-LTE parameters and structural lengths of a two-dimensional stratified atmosphere. At the surface, cooling is less efficient in non-LTE than in LTE. At large optical depths, both become equal and are non-negligible. In these layers horizontal transfer effects become important for the energy balance.
Kneer Franz
Trujillo-Bueno Javier
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