T.Tomov[1,2], D.Kolev[3], M.Mikolajewski[4], P.Marrese[1] & U.Munari[1,2]
[1] Osservatorio Astronomico di Padova, Sede di Space, Univ. of Padova, Italy
[3] National Astronomical Observatory Rozhen, Smolyan, Bulgaria
[4] Centre for Astronomy, Nicolaus Copernicus University, Torun, Poland
High-resolution spectral observations of the recurrent nova RS Oph in the H_alpha region are presented. These observations confirm the random appearing of blue or/and red H_alpha emission features extended up to ± 2000 km/s. Remarkable variations in the shape and the intensity of these emissions on time scales of the order of 1-2 days are evident. Such kind of emission components are also observed in the spectrum of CH Cyg. The observed radio jets, the flickering in the optical brightness as well as the high-velocity, possible centrifugal, outflow make of RS Oph a binary system very similar to CH Cyg and MWC 560. For these all objects a magnetic white dwarf as the active component was suggested.