Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..617s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Nov. 1980, p. 617-629.
Astronomy and Astrophysics
Astronomy
64
Atomic Excitations, Electron Transitions, Fluorescence, Oxygen Ions, Oxygen Spectra, Ultraviolet Astronomy, Cascades, Line Spectra, Planetary Nebulae, Transition Probabilities
Scientific paper
Transition probabilities and relative intensities are calculated for transitions between O III triplets excited by the Bowen fluorescence mechanism, which have been observed in the optical spectra of nebulae. A frozen cores approximation is used to obtain wavelengths and oscillator strengths for the dipole transitions and the probabilities of a Bowen cascade and the various transitions within the cascade following excitation of the 2p 3d 3P(0)2 state of O III. Intensities of the O III lines and multiples calculated relative to those for the He II line at 4686 A and cascade proportions are shown to agree with the values observed in the optical and UV of the planetary nebula NGC 7662. The observed relative intensities of the O III lines, in the solar spectrum at wavelengths of 644 and 374 A, however, are found to be inconsistent with the Bowen mechanism.
Saraph Hannelore E.
Seaton M. J.
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