Abstract
SODIUM D lines of emission were identified beyond any possible doubt in the heads of the following comets: Wells, (1882a); Great Comet, 1882 (1882b); 1910a; Halley's Comet (1910c); and Brooks' Comet, (1911c). The appearance of these lines has always been of temporary character at perihelion. The spectra of the first three comets were observed either visually or by means of a prismatic camera, so that the only reliable determinations of wave-lengths are furnished for the comets Halley and Brooks. The spectrum of the former was taken by E. C. Slipher (Lowell Observatory Bull. 52) with the slit spectrograph of Lowell Observatory, and that of the latter by W. H. Wright (Lick Observatory Bull. 209) with the Lick refractor.
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LEMON, H., BOBROVNIKOFF, N. Relative Intensities of the D1 D2 Lines of Sodium in Comets and in Low Pressure Laboratory Sources. Nature 117, 623 (1926). https://doi.org/10.1038/117623a0
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DOI: https://doi.org/10.1038/117623a0
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