H-ALPHA VARIABILITY OF THE B-TYPE BINARY CHI-AURIGAE

We report several new radial velocities of the early-type spectroscopi c binary chi Aur derived from photographic and RETICON spectrograms. i mproved orbital elements are computed and a new orbital period P = 676 days of this system is derived. The secondary component lines are inv isible in the spectrum of the system with the supergiant primary. Spec tral type of the secondary component is discussed. The description of the spectrum chi Aur in the wavelength range from 6300 to 6700 Angstro m is presented. H alpha emission and its variability was discovered an d H alpha profile behaviour is described and analyzed.