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Variability of optical and X-ray spectra of Gamma Cassiopeia stars

Yakunin, I. A.; Kholtygin, A. F.; Ryspaeva, E. B. +1 more

Stars of the γ Cas type (γ Cas analogs) belong to a small group of Be stars with a high X-ray luminosity of 10 31 ‑ 10 33 erg/s and an anomalously high temperature of the plasma emitting in the X-ray range of 10–20 keV or more, assuming a completely thermal X-ray emission. The results of the analysis of the optical spectra of γ Cas under the progr…