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The New Star in Aquila

Nature volume 101, pages 285286 (13 June 1918) | Download Citation



The spectrum of the Nova was observed by me on June 10 with a McClean stari spectroscope on a 3-inch refractor, and on June 11 with a Zöllner spectroscope on the 6-inch refractor at the Imperial College. It was not notably different on the two evenings, except that the continuous background was possibly more intense on June 10. In each case the spectrum strongly recalled those of Nova Aurigæ and Nova Persei in their early stages, shortly, after maximum brightness. The most striking feature of the spectrum was the red line of hydrogen, which was of extraordinary brilliancy. In the green there wag a group of four bright lines, of which the most refrangible and brightest was doubtless Hβ, while the others may well have been the enhanced lines of iron about wave-lengths 517, 502, and,492, which were observed in previous novæ. Another conspicuous line in the blue was probably Hγ. There was also a broad nebulous line about λ 532, and another of the same character which was roughly estimated to be about λ 560. On the red side of the; latter was a dark shading, and there was a strong, absorption line or band which was estimated to be in the position of sodium D. There was possibly a bright fringe on the red side of this absorption line. Between D and C there were two fairly conspicuous bright lines, which were estimated to be in the neighbourhood of λ 615 and λ 630. The star was brighter than Altair, and was of a reddish-yellow colour.

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