Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88..451c&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 3, June 1991, p. 451-470.
Astronomy and Astrophysics
Astrophysics
2
Hydrogen, Interstellar Gas, Molecular Collisions, Nonequilibrium Thermodynamics, Opacity, Absorptivity, Analytic Functions, Cooling, Galactic Evolution, Hydrogen Clouds, Low Temperature
Scientific paper
The cooling and absorption functions due to rotovibrational transitions of the H2 molecule were evaluated. This is done by computing the NLTE level populations, taking into account collisions between molecules, collisions between molecules and H atoms, and the effect of a radiation field modeled with a blackbodylike field at a temperature T(rad). Sources considered as opacity were both bound-bound transitions in the rotovibrational levels of the molecule, and the radiation scattering on bound electrons. The absorption coefficient is averaged on the wavelength spectrum adopting the Planck function as a weight. In some cases, analytic fits to the computed values vs the state variables are presented and discussed. Both emission functions and opacities are also presented in tabular form.
Capuzzo-Dolcetta Roberto
di Fazio A.
Palla Fabrizio
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