Radial Velocities of Cepheid Variable Stars

Uniform radial-velocity determinations have been made for 128 variable stars of the ~ Cephei type with periods from i.~ to 45 days. With low-dispersion spectrographs the observations have been extended to the fourteenth photographic magnitude. Tests for systematic errors were made by comparing results for stars having similar spectra with Lick determinations. Velocity-curves were drawn for ioó stars. From these curves the normal velocity, range, and certain characteristic features were deduced. Incomplete data were also obtained for 22 additional stars. Diagrams were plotted showing the relationship be- tween period and certain properties of the stars such as light- and velocity-range, shape of the curves, and lag of the velocity-curve at maximum and minimum of light