Abstract
NEAR the normal positions of the diffuse series lines of both par- and ortho-helium, one finds very broad absorption lines in the spectrum of many B-type stars. The symmetry of each structure is imperfect in that the violet side represents the stronger absorption, and the profile indicates a complex nature. The purpose of this note is to point out in more detail the characteristics of the profiles, and to suggest possible origins of the main features.
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FOSTER, J., DOUGLAS, A. Analysis of Profiles of Helium Lines in Spectra of B Stars. Nature 134, 417–418 (1934). https://doi.org/10.1038/134417a0
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DOI: https://doi.org/10.1038/134417a0
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