ИСТИНА

We present an analysis of photometric BVRcIc and spectroscopic observations of IN Vir - cool spotted variable star. CCD photometry was conducted in Crimea on mount Koshka in 2015–2018. High- and medium-resolution ́echelle spectroscopy was obtained at Staŕa Lesna and Skalnate Pleso observatories in 2016–2018. Photometric observations were corrected for atmospheric extinction which was carefully studied. Spectroscopic data reveal both components in the system: fairly-rapidly-rotating primary and faint slow-rotating secondary. Rotational velocities of the components are v1sini= 24.6km/s and v2sini < 8km/s. Our observations show that the primary component is a giant of K2 spectral class. Basic parameters of the stars: masses, temperatures, radii, and the orbital elements were found. Our BVRcIc photometry allowed us to estimate the inclination of the rotational axis of of the primary star to the line of sight. The amplitude of variability is the highest in B photometric band. The analysis of our photometry together with the ASAS data revealed a solar-like activity cycles of the primary component with about 7 years period. IN Vir started its new cycle of activity this summer. We’ve found that the period of the photometric variability isn’t equal to the orbital period.