Searching for Phase-Locked Variations of the Emission-Line Profiles in Binary Be Stars

There is growing evidence that many Be stars are parts of binary systems. As the B-type primaries very fast rotators and their spectral lines may be distorted by circumstellar material, it not easy to measure radial velocity directly from lines. It has been shown some binaries exhibit peak intensity variations consisting double-peaked Hα phase-locked with orbital periods. We searched for such in spectra 12 stars, including several known suspected binaries. Our results include confirmation periods ν Geminorum, ϵ Capricorni, κ Draconis, 60 Cygni, V2119 its refinement o Puppis, as well suggesting hints binarity Aquarii, BK Camelopardalis, 10 Cassiopeae. Monitoring line profile β Canis Minoris over last years gives further support existence a 182.5-day period found earlier smaller set data. A similar but still preliminary (179.6 days) was ψ Persei. first time Geminorum exhibits emission ratio and, therefore, part inner this triple system. show mentioned observed more systems than previously can used search when application other methods inconclusive.