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Nature volume 63, page 502 (21 March 1901) | Download Citation



NOVA PERSEI.—Prof. H. C. Vogel describes, in the Astronomische Nachrichten (Bd. 154, No. 3693), the results of measures of photographs of the spectrum of Nova Persei, taken with the 80 cm. refractor and spectrograph of small dispersion. The spectra extend from λ 3740 to λ 5800. Wave-lengths have been determined by comparisons with the spectrum of β Orionis (Rigel). Tables of the wave-lengths of the deduced lines are given, the origins being traced to hydrogen, calcium, magnesium and silicon. The displacements of the lines is shown to indicate a velocity of some 700 kilometres per second relative to the earth; an exception to this occurs in the case of the two calcium lines at H and K, which are indicated as giving velocities of approach of only 45 kilometres per second.

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