Bibcode
Trujillo-Bueno, J.; Kneer, F.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 183-186.
Fecha de publicación:
3
1987
Número de citas
5
Número de citas referidas
5
Descripción
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.