Abstract
NOVA GEMINORUM No. 2.—The more salient features of two series of spectrograms taken at the Pulkowa Observatory (March 15–18 and March 25 and 26) are described by Dr. Tikhoff in No. 2, vol. v., of the Mitteilungen of that observatory. The scale was small, 6.3 mm. from Hβ to H???, but the negatives clearly disclose the extraordinary changes which took place in the spectrum of the nova. By employing different plates and filters, Dr. Tikhoff secured negatives giving the whole spectrum from Hα to Hη, and he states that on March 15 the characteristic feature was a series of intense absorption lines, both broad and narrow, the bright lines being but little brighter than the intense continuous spectrum. He classifies the spectrum as lying between types F and G. On March 16 the continuous spectrum generally had diminished considerably in brightness, except in the ultra-violet, where it was brighter and extended to about λ3600; the absorption bands of hydrogen were scarcely visible on this date, although H and K were very strong and the bright bands of hydrogen very intense. The striking features on March 25 were the reappearance of the absorption bands and the strong continuous spectrum.
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Our Astronomical Column . Nature 89, 384–385 (1912). https://doi.org/10.1038/089384a0
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DOI: https://doi.org/10.1038/089384a0