Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc

R. K. Zamanov, K. A. Stoyanov, D. Marchev +7

We present new spectroscopic observations of the Be/black hole binary MWC 656 obtained during the period 2015 - 2021. We measure the equivalent width of H$\alpha$ (EW${}_{\alpha }$), H$\beta$ ($E{W}_{\beta }$…