Regularities of color and brightness variations of R Coronae Borealis-type variable stars during the active state according to observational data in the visible range

Color and brightness variations of RCrB star during three brightness minima with different depth, that is: 1982, 1983-1984 and 1985 - are considered. Variations of color indices are shown to depend on minimum depth: color indices decreases in minimal brightness phase during deep minimum, while in 1982 minimum they increase as compared to brightness maximum of variable. Occurrence of additional radiation during brightness decrease the intensity of which is maximal one in shortwave range represents common feature for three minima of RCrB star. It is stressed, that high amplitude brightness pulsations at reduced brightness of these stars may be considered as brightness secondary minima. On the basis of photoelectric observations it is assumed, that distortions of brightness monotonous variation for RCrB type stars in weakened state (flanges, abrupt variations of brightness reduction velocity) results from overlap of brightness secondary weakenings on brightness curves during minima