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Paper: The Be Star Omicron Cassiopeiae
Volume: 310, Variable Stars in the Local Group (IAU Colloquium 193)
Page: 387
Authors: Koubsky, P.; Ak, H.; Harmanec, P.; Yang, S.; Bozic, H.
Abstract: The analysis of radial velocities (RVs) of the Be star oCas from 27 high S/N spectra allowed us to revive the binary nature of thie star, first suggested by Abt and Levy (1978, “AL”), but later refuted by several authors. The period search in our RV data based on measurements of Hα emission and He I λ6678 Å absorbtion profiles detected a dominant peak close to the 1033-d period found by AL. The resulting curves are very smooth. The rms error of the solution by AL. If the RV variations are due to orbital motion, then oCas turns out to be a challenging system with an unseen secondary component with mass comparable to, or even more massive than the primary.
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