Computer Science
Scientific paper
May 1935
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1935natur.135..879s&link_type=abstract
Nature, Volume 135, Issue 3421, pp. 879 (1935).
Computer Science
Scientific paper
AFTER dropping in brightness at the end of April to about mag. 13, this star has brightened markedly again. A spectrogram secured by an 8-hours exposure spread over two nights, May 17-19 (with the star's magnitude at 10.6m-10.2m) shows a complete change of spectrum. The lines of Fe II and [Fe II] have vanished, and the lines of [O I] are much weaker. The hydrogen lines are stronger again and N II, [N II] and He II are all represented. The strongest lines are now the well-known nebular lines of [O III] at 5007, 4959 and 4363. At an earlier stage (late in March) bright bands appearing simultaneously at 4360, 5006 were identified as [O III] lines. As the changing spectrum developed, it became clear that these bands were due to [Fe II] and N II respectively. The presence of a bright line at 4959 and the absence of [Fe II] show that the [O III] lines are now present. This transformation to the spectrum of a planetary nebula and nucleus is typical of novæ.
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