PUBLICATIONS OF THE ASTRONOMICAL OBSERVATORY OF BELGRADE 107, Page 13-20, https://doi.org/10.69646/14sbac02p
PPROCEEDINGS OF THE XIV SERBIAN-BULGARIAN ASTRONOMICAL CONFERENCE, Vrnjačka Banja, Serbia, September 23-27, 2024, Eds. Milan S. Dimitrijević, Evgeni Semkov, Zoran Simić, Goran Damljanović, Momchil Dechev
Published by: Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia

Low states light curves of VY Scl type systems show rises with amplitudes 35 mag. Despite the accepted belief that this type of star does not exhibit outbursts similar to the dwarf novae (DNe) one, their amplitudes, shapes and periods are similar to DNe with the same orbital periods. MV Lyr, TT Ari and KR Aur show periodicities in the range 200-400 d, but second maximum in power spectra also occurs around 850-1000 d.The estimation of the change of mass loss via coronal mass ejections during the solar activity cycle can vary more than 5 times. The red dwarfs magnetic cycles with duration of years can explain the reduced mass transfer and long deep states in VY Scl variables.