Abstract
I. IN publishing a few days before his death the last part of his discoveries relating to the spectra of stars of the third class, D'Arrest pronounced the opinion that henceforward there would, be nothing essential to add to the knowledge then possessed of the stellar spectra of this class in the northern heavens. When D'Arrest died, 123 well-developed objects of Class III.a were known, and counting all the objects known, 150; the stars known in Class III.b were 23. Actually, the well-developed stars of III.a are 214, and if all are reckoned, 475; the stars of III.b are 55 at least.
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Dunér on Stars with Spectra of Class III 1 . Nature 37, 234–236 (1888). https://doi.org/10.1038/037234b0
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DOI: https://doi.org/10.1038/037234b0