Abstract
ALTHOUGH the two well-known lines of [O III] λ=5007 A. (3P2–1D2) and λ = 4959 A. (3P1–1D2) are the most prominent features in the spectra of planetary nebulæ and novæ at the nebular stage, the third line of the triplet, corresponding to the3P0–1D2 transition, for which the calculated wave-length is λ= 4931·8 A., has not been generally observed. Recently, however, Bowen and Wyse1 attributed to the3P0–1D2 transition the faint line which they observed in the spectra of the nebulæ N.G.C. 7027 and N.G.C. 6572.
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References
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DUFAY, J., BLOCH, M. The Forbidden 3PO–1D2 Line of O III in the Nebular Spectrum of Nova Herculis 1934. Nature 144, 593–594 (1939). https://doi.org/10.1038/144593b0
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DOI: https://doi.org/10.1038/144593b0
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