The periodic behavior of the HeI 6678 Å emission line in gamma Cas
Ernst Pollmann1, Joan Guarro Fló2,1 Emil-Nolde-Str. 12, 51375 Leverkusen, Germany 2 Balmes 2, 08784 Piera (Barcelona), Spain
The observations of the V/R variability of the HeI 6678 Å line in the spectrum of gamma Cas is presented for the first time. The spectra with a resolution of R~17000 were obtained with the Littrow grating spectrograph LHIRES III and the C14 Schmidt-Cassegrain telescope of the Vereinigung der Sternfreunde Köln (Pollmann) and the Piera-Barcelona observatory Spain (Guarro). The signal-to-noise (S/N) in the continuum near the HeI 6678 Å line was always higher than 1000 (higher than 1500 in most spectra). We found that this variability has a period of 280 d with a clear orbital independency.
Published as IBVS No. 6103