Emission line variations in RS Canum Venaticorum-type binaries

Abstract

Photoelectric spectrophotometry of the H&K and Hα emission lines in six close binaries is reported. UX Ari, RS CVn, Z Her, AR Lac, LX Per and SZ Psc were observed throughout 1974 with a rapid-scanning spectro-photometer attached to the 1-m reflector at Northwestern University. Composite emission–absorption equivalent widths were obtained for both spectral intervals in each system.