Solar-type stars activity in M67 cluster

On the base of the observations of the Kepler mission (K2) we perform an analysis of the brightness variability of 98 objects from the M67 cluster with age which is comparable to the age of the Sun. Analyzing the periods of rotation and the area of spots on the surface of stars we studied the manifestations of activity in 4 solar-type stars. The values of these parameters are in good agreement with the solar values, which may indicate the reliability of the estimate of the age of the M67 cluster (5.4 ± 0.2 billion years).