Abstract
STARS HAVING PECULIAR SPECTRA.—From a communication by Prof. E. C. Pickering to Astronomische Nachrichten, No. 3054, it appears that the hydrogen lines G and h are bright in a photograph of the spectrum of a third-type star, D.M. + 39° 4851 (RA. 22h. 247m., Decl. + 39° 48′, 1900), taken on July 6. And an examination of the photographs this region taken on different dates has confirmed the long-period variability of which this spectroscopic appearance is now recognized as a distinctive feature. The seventh magnitude star D.M. – 10° 5057, whose approximate position for 1900 is R.A. 19h. 17˙7m., Decl. – 10° 54′, has been previously announced as having a spectrum of the fourth type, but later photographs show that the lines in the spectrum are not those due to hydrogen, but are sometimes seen to be broad bands, and other times as doubles. These peculiarities, however, cannot be made out in the visible spectrum of the star.
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