Solar-type Activities and Brightness Variations in Three Binary Star Systems

This survey presents our study of brightness variations exhibited by three binary star systems at various time-scales.We use observational data obtained from the Transiting Exoplanet Survey Satellite (TESS); the 2m telescope of the National Astronomical Observatory (NAO) Rozhen and the American Association of Variable Star Observers (AAVSO) International Database.Observations cover the different periods of time in optical bands of the selected binary systems: the visual binary with a solar-type dwarf 61 Cyg (Cygnus); the spectroscopic binary YY Gem (Gemini) and the ER UMa type dwarf novae IX Dra (Draconis).The indicated types of variability in brightness are compared to some solar type of activities, including flares, seen in the optical and X-ray bands.States of outbursts are also detected during the observational periods and we explore the possibility that the studied stars could exhibit solar-type bursts.We examine the similarities in the manifestation properties between the three targets and the Sun, and discuss their feasible sources.