Lines of carbon, nitrogen, and oxygen ions in the spectra of planetary nebulas. I. Transition probabilities and oscillator strengths

Abstract

In this paper, the energy levels, wavelengths and transition probabilities have been calculated for some astrophysically important lines of the ions C II, C III, N III, N IV, O IV, and O V. These quantities are subsequently used to calculate the line intensities of these ions and to determine the abundance of the ions of carbon, nitrogen, and oxygen in a number of planetary nebulas. Single-configuration Hartree-Fock calculations are used in this paper to obtain the greater part of the transition probabilities and were made using the programs described. The examples given show that the configuration superposition method using the transformed functions make it possible to take into account the greater part of the correlation effects and find fairly accurate transition values.