Properties and nature of Be stars - 29. Orbital and long-term spectral variations of γ Cassiopeiae
Properties and nature of Be stars - 29. Orbital and long-term spectral variations of γ Cassiopeiae
A detailed analysis of more than 800 electronic high-resolution spectra of gamma Cas, which were obtained during a time interval of over 6000 days (16.84 yr) at several observatories, documents the smooth variations in the density and/or extent of its circumstellar envelope. We found a clear anticorrelation between the peak …