The results of our analysis of the optical spectra of 𝛾 Cas type stars under the large observation program Line Profile Variability in the Spectra of OBA Stars and the Nature of their X-Ray emission and the results of a study of the archival X-ray spectra of these stars based on the XMM-Newton satellite observations are presented. A fast variability of the line profiles in the optical spectra of 𝛾 Cas type stars on scales from several minutes to hours, as well as a similar fast variability of their X-ray light curves are detected.

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