Abstract
THE SPECTRA OF NOVA GEMINORUM.—In the publications of the Allegheny Observatory of the University of Pittsburg (vol. iii., No. 3) Mr. F C. Jordan gives a description of eighteen spectrograms of Nova Geminorum (No. 2). The first of the series of photographs was secured on March 16, when the bright lines were strongly developed on the plate, and the absorption lines a little less so, and the last on April 14, when no absorption lines were detected at all. The author gives tables of the wave-lengths determined, and a series of intensity curves. He mentions the curious fact that with regard to the H and K absorption lines the weighted means of the velocities deduced from them yield a curve which follows to some extent the light variations of the nova, the velocities being positive when the star is brighter and negative when it is fainter. Air. Jordan suggests that it would be very desirable to examine the velocity determinations from plates secured at other observatories, and for this and other points of view he would place all the plates he secured at the disposal of any astronomer or institution that may decide to undertake such a discussion.
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Our Astronomical Column . Nature 91, 252–253 (1913). https://doi.org/10.1038/091252a0
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DOI: https://doi.org/10.1038/091252a0