Abstract
IN a letter to NATUEE of Oct. 1, 1927, p. 473, Mr. Bowen has announced the very interesting relationship that some of the lines of unknown origin which are found in the nebulæ and in the Wolf-Rayet stars and were so long attributed to a hypothetical element nebulium, are really due to ionised light elements like O++, N++, O+, N+; they do not arise from the transitions usually allowed, but are due to transitions which are usually prohibited. Prof. A. Fowler has also lent his support to this hypothesis. The object of this note is to discuss the nature of these transitions.
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SAHA, M. The Origin of the Nebulium Spectrum. Nature 121, 418 (1928). https://doi.org/10.1038/121418a0
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DOI: https://doi.org/10.1038/121418a0
