Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..465l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 3, p. 465-496.
Astronomy and Astrophysics
Astronomy
23
Charge Transfer, Fluorescence, Oxygen Spectra, Planetary Nebulae, Line Spectra, Molecular Ions, Spectral Energy Distribution
Scientific paper
Measurements of O(2+) Bowen fluorescence and charge transfer lines are presented. Efficiencies of the Bowen fluorescence mechanism are derived for 15 objects, and a wide range of efficiencies is apparent. There is a strong linear correlation between the Bowen efficiency, the fractional abundance of oxygen in the ionization stage of O(2+) and the fractional abundance of helium in the form of He(+). Evidence that the Bowen efficiency is anticorrelate with the electron temperature is established. The O III 3261, 3265, and 3627 lines are found to originate from radiative and dielectronic recombination. These lines are used to derive reliable O(3+) abundances for some objects.
Danziger John
Liu Xiao-Wei
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