The Spectra of U Geminorum Type Variable Stars.

Spectrograms of several U Geminorum variable stars and of a few related objects have been obtained with the Cassegrain spectrographs on the 82-inch telescope. The linear dispersions varied from 75 A/mm to 340 A/mm at Hy. Descriptions of the spectra of the following objects are given for one or more phases in their light-curves: UTJ Aqi, SS Aur, SS Cyg, U Gem, X Leo, AY Lyr, RU Peg, STJ TJMa, TW Vir, RX And, Z Cam, All Her, CN On, TZ Per, EY Cyg, CY Lyr, CO On, UX On, CL Sco, T Pyx, and V Sge. A brief summary is given of the characteristics of the spectra of the U Geminorum type of variable stars at minimum and maximum light