An eccentric wave in the circumstellar disc of the Be/X-ray binary X Persei

R. K. Zamanov, K. A. Stoyanov, U. Wolter +7

We present spectroscopic observations of the Be/X-ray binary X Per obtained during the period December 2017 - January 2020 (MJD~58095 - MJD~58865). In December 2017 the $H\alpha$, $H\beta$,…