Abstract
THE SPECTRUM OF NOVA PERSEI.—Prof. Vogel, in a recent communication (Sitzber. d. k. Akad. der Wiss. zu Berlin, March 21, xvi.), gives the results of a discussion of the Potsdam observations of Nova Persei. Prof. Vogel considers that the spectrum can only be explained on the hypothesis of Wilsing. The immense perturbations in the star give rise to great differences of pressure in the layers of the materials composing the Nova, and these differences account not only for the presence of the bright and dark lines, but their great breadth. Prof. Vogel does not think that there is any reason to assume that the apparent great displacement of the dark lines is the consequence of a large motion deduced on the principle of Doppler. This displacement he accounts for on the supposition of the overlapping of the broad dark band over the bright hand, the great pressure of the substance giving the bright band being more strongly developed on the red side, thus allowing the dark band to appear more prominent on the violet side.
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