Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...33..311m&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 33, Sept. 1978, p. 311-313.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Helium, Line Spectra, Molecular Spectra, Populations, Radiant Flux Density, Electron Density (Concentration), Electron Energy, Electron Impact, Graphs (Charts), Reaction Kinetics
Scientific paper
Line intensities of resonance, forbidden, and intercombination transitions have been deduced from population densities computed for all levels with principal quantum number n = 2 in several heliumlike ions from C V to Ni XXVII as a function of electron temperature and density, external radiation field, and proton and alpha-particle densities. The excitation and deexcitation mechanisms considered in the calculations are identified. Plots are presented which: (1) give the solution for steady-state ionization equilibrium as a function of reduced electron temperature in terms of relative ion densities; (2) show some intensity ratios for the limiting case of zero electron density; (3) give the composite rate coefficients, including those involving cascade effects from higher levels; (4) illustrate the effect of processes connecting the upper levels of forbidden and intercombination lines on the intensity ratio of these lines as a function of the reduced electron density and the blackbody temperature of the external radiation field; and (5) give the dependence of the forbidden/intercombination line intensity ratio on the blackbody temperature of the external radiation field.
Mewe Rolf
Schrijver J.
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