Other
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..403k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 403-406. SERC-supported research.
Other
25
Astronomical Spectroscopy, Emission Spectra, Line Spectra, Oxygen Ions, Planetary Nebulae, Atomic Energy Levels, Electron Energy, Ratios, Seyfert Galaxies, Ultraviolet Spectra
Scientific paper
Recent R-matrix calculations of electron excitation rates in O III are used to derive electron temperature and density-sensitive emission-line ratios R1 = I(2322 A)/I(1661 A + 1667 A), R2 = I(1661 A + 1667 A)/I(4960 A + 5009 A), and R3 = I(4363 A)/I(4960 A + 5009 A) for a range of Te (7500-40,000 K) and Ne 10 to the 2nd to 10 to the 7th/cu cm applicable to gaseous nebulae. Electron temperatures and densities deduced from these and observed values of R1, R2, and R3 for several planetary nebulae and a Seyfert galaxy in general show good internal agreement and also compare favorably with results deduced from the line ratios of other species, thereby providing support for the atomic data adopted in the calculations.
Aggarwal Kanti M.
Keenan Francis P.
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