The Velocity-Curve and Spectral Variations of 27 Canis Majoris

The velocity-curve of 27 Canis Majoris is derived from observations covering the years 1925-1931. The period is 2000 days or longer and the amplitude is 220 km/sec. The minimum mass is 20000. The double bright components of the hydrogen lines show variations in intensity which are probably re'ated to the period of the velocity-curve. No emission could be seen in lines of other elements (helium, magnesium, silicon, or carbon). The absorption lines show striking changes in intensity, which are also re]ated to the period of the velocity-curve. They are weakest at the time of maximum velocity, and appear greatly strengthened when the velocity is at minimum