Abstract
VARIABLE STAR CLUSTERS.—The recent announcement by Prof. Pickering, of the discovery of variability in a large number of stars forming parts of star clusters (NATURE, vol. liii. p. 91), has led Dr. Belopolsky to examine some of the photographs of clusters taken at Pulkowa. Two photographs of the cluster M3 (N.G.C. 5272), in Canes Venatici, were taken in March 1894, and two more in April 1895. In the later photographs one sar was found to be two magnitudes brighter than in 1894, and differences of brightness can also be traced in the case of other stars among the 1800 shown upon the photographs (Asi. Nach., 3338). The Arequipa negatives of the same cluster indicated a variation of brightness in eighty-seven stars, amounting in some cases to at least two magnitudes.
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Our Astronomical Column. Nature 53, 474–475 (1896). https://doi.org/10.1038/053474a0
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DOI: https://doi.org/10.1038/053474a0