Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88...31r&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 1, April 1991, p. 31-45.
Astronomy and Astrophysics
Astrophysics
3
Atomic Collisions, Gas Ionization, Hydrogen Atoms, Interstellar Gas, Plasma Slabs, Astronomical Models, Gas Temperature, Line Spectra
Scientific paper
Model computations of the conditions of hydrogen ionization and excitation in plane-parallel homogeneous slabs with constant velocity gradients were carried out for a wide range of physical parameters, including the temperature and density of gas and the background thermal radiation field. The model hydrogen atom includes 15 bound n levels, with the first four levels being split into the l-sublevels; the atomic processes considered include stimulation in radiative decays and recombinations, ionization from all levels, collisional processes, and 2s two-photon decays. Results are presented in the form of tables containing information on ionization fractions, optical depths in selected lines and continua, and line intensity ratios for the first three lines of the first four series. Processes which set the ionization state of the gas in various regimes are identified.
Giovanardi Carlo
Natta Antonella
Palla Fabrizio
Randich Maria Sofia
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