Abstract
R-matrix calculations of electron impact excitation rates in 0 III are used to derive the electron-density-sensitive emission-line ratioR = 1 (2s 2 2p 23 P 2-2s 2 2P 23 P 1)/I (2s 22p 23 P 1 - 2s 22p 23 P 0) =I (52μm)/I (88μm) for a range of electron temperatures(Te = 5000-20000 K) and densities(N e =10–10 5 cm−3) applicable to planetary nebulae. Electron densities deduced from the observed values ofR in several planetary nebulae are in excellent agreement with those deduced from C1 I and Ar IV, which provides support for the accuracy of the atomic data adopted in the calculations.
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Keenan, F.P., Aggarwal, K.M. The O III 52 ▪m/88 ▪m emission-line ratio in planetary nebulae. J Astrophys Astron 9, 237–241 (1988). https://doi.org/10.1007/BF02715069
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DOI: https://doi.org/10.1007/BF02715069