Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..699l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 3, p. 699-710.
Astronomy and Astrophysics
Astronomy
6
Charge Transfer, Fluorescence, Oxygen Ions, Planetary Nebulae, Astronomical Spectroscopy, Molecular Orbitals, Recombination Reactions, Stellar Spectra
Scientific paper
The study compares measurements of O(2+) Bowen fluorescence and charge transfer lines in nine planetary nebulae with theoretical predictions, taking into account contributions from the Bowen fluorescence mechanism, the charge transfer reaction between O(3+) and H(0), and radiative and dielectronic recombination. In general, good agreement is found. It is shown that excitation by absorption of the stellar continuum UV radiation is negligible for these lines. There is a good positive correlation between the strength of the charge transfer reaction and the degree of excitation of the nebulae. The relative charge transfer rate coefficients into singlet and triplet levels of O(2+), k(2p3p3DJ)/k(2p3p1P)(J = 1, 2, 3), are derived and on average are equal to 1.2, independent of the statistical weight 2J + 1 of the fine-structure level.
Danziger John
Liu Xiao-Wei
Murdin Paul
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