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- Title
The Radio Recombination Line Intensities Of Atoms And Ions: Helium, Carbon And Oxygen.
- Authors
Rovenskaya, N. I.
- Abstract
The radio recombination line intensities of heavy elements of helium, carbon and oxygen are calculated with accounting for dielectronic recombination. Dielectronic recombination rates are determined accurate to the second order of a perturbation theory and the rates are described as function of principal quantum number for helium-like atom or ion. Balance equations are solved for the departure coefficients from LTE b n . The collision and spontaneous transition rates are accounted for the balance equations, in which non-equilibrium distribution source is dielectronic recombination. Non-equilibrium amplification coefficients are found as functions of a medium temperature, density and ion charge z = 1–3 for radio recombination lines. Optical depths are calculated for the heavy element low-frequency lines with the numbers 300 > n > 1200. For the chosen electronic temperatures and densities T e = 0.8× 104–10× 104 K, N e = 0.05–0.1 cm−3 the line optical depth is determined by the values τL∼ 0.1× 10−4–100× 10−4. Calculated for free-free transition rates, the optical depth is given by using the value τff∼ 10−2τL.
- Subjects
RADIO recombination lines; ATOMS; IONS; HELIUM; CARBON; OXYGEN
- Publication
Astrophysics & Space Science, 2005, Vol 300, Issue 4, p357
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-005-4499-7