Abstract
PERIODICAL VARIATION IN THE BRIGHTNESS OF NEBULÆ.— In 1877, in a communication to the Royal Astronomical Society, Prof. Winnecke drew attention to the nebula H. II. II. 278, remarking that it appeared to exhibit not only a variability in its light, but, which he considered much more remarkable and difficult of explanation, that periodical fluctuations of brightness seemed to take place. A short time since he briefly pointed out a second case of similar character, in the nebula H. I. 20; in the last number of the Astronomische Nachrichten he returns to the subject, and collecting the descriptions of the latter nebula, presents very strong evidence of the variability of its light and indications that it may prove periodical.
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Our Astronomical Column . Nature 21, 307–308 (1880). https://doi.org/10.1038/021307a0
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DOI: https://doi.org/10.1038/021307a0