Nova Herculis, 1934

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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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