# Properties and nature of Be stars - 29. Orbital and long-term spectral variations of γ Cassiopeiae

@article{Nemravova2012PropertiesAN,
title={Properties and nature of Be stars - 29. Orbital and long-term spectral variations of $\gamma$ Cassiopeiae},
author={J. Nemravov'a and P. Harmanec and P. Koubsk'y and A. Miroshnichenko and S. Yang and M. vSlechta and C. Buil and D. Korvc'akov'a and V. Votruba},
journal={Astronomy and Astrophysics},
year={2012},
volume={537}
}
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 intensity and FWHM of the Hα emission, which seems to agree with recent models of such emission lines. The main result of this study is a confirmation of the binary nature… Expand