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- W4366711550 abstract "Tables of forbidden lines, based on recently published term values, have been prepared for the ions Cr III, Mn III, Co III and Ni III. Using the data of these tables a search has been made for the leading [Cr III], [Mn III], [Co III] and [Ni III] lines in the spectra of various celestial objects characterized by high ionization conditions. In the case of [Cr III] a number of coincidences of the predicted lines with unidentified features in the spectrum of the Orion Nebula (as observed by A. B. Wyse) are found. However, owing in part to the apparent absence of [Cr III] 5715, the expected leading transition of the multiplet a5D-a3P, this evidence for the presence of [Cr III] in the Orion Nebula, although suggestive, can hardly be considered conclusive. In the 1939 spectrum of the peculiar star RY Scuti (observed by P. Swings and O. Struve) coincidences are found for two [Cr III] lines that are expected to be strong. The case for [Mn III] is rather unfavorable inasmuch as even the first excited state has an excitation potential of 3.3 ev. It is perhaps noteworthy, however, that [Mn III] 5969, 5968, 5971 of the multiplet a4G-a4F coincide with an unidentified line observed by Wyse in the spectrum of the planetary nebula NGC 7009 (perhaps in NGC 6741 as well) and that a number of the principal transitions of the same multiplet coincide with the emission lines λλ 5971, 5944 observed by Tcheng Mao-Lin in the July, 1948 spectrum of the peculiar star Z Andromedae. There seems to be no convincing evidence for [Co III] in any of the spectra reviewed, except possibly in that of NGC 7009." @default.
- W4366711550 created "2023-04-24" @default.
- W4366711550 creator A5063067698 @default.
- W4366711550 date "1953-01-01" @default.
- W4366711550 modified "2023-09-25" @default.
- W4366711550 title "Remarques sur l’identification dans les spectres d’objets célestes, de raies interdites dues à Cr III, Mn III, Co III et Ni III" @default.
- W4366711550 doi "https://doi.org/10.3406/barb.1953.69898" @default.
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