Abstract
THE VARIABLE NEBULA IN CORONA AUSTRALIS.—A somewhat extended investigation of this remarkable object—N.G.C. 6729—has been made at Helwan with the Reynolds 30 in. reflector, and a brief account of the observations, with illustrations, has been given by J. H. Reynolds (Monthly Notices, R.A.S.,vol. Ixxvi., p. 645). The thirty-seven photographs taken during 1914 and 1915 clearly demonstrate that the nebula is variable in form as well as in brightness, and it seems probable that its variability is closely related to that of the variable star R Coronas Australis, to which it appears to be attached. The appearance is such as might be expected if the nebulous matter was discharged from the star when at its maximum brightness and illuminated by it.
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Our Astronomical Column . Nature 98, 56 (1916). https://doi.org/10.1038/098056a0
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DOI: https://doi.org/10.1038/098056a0