Activity cycles in solar-type stars

We propose to continue the ongoing longterm monitoring program of a sample ofsolartype stars to search for cyclic behavior, analogous to the one observedfor the Sun, in their Xray emission. These stars have moderate levels ofactivity and are thus true solar analogs... XMMNewton makes it possible, forthe first time, to efficiently monitor the lowactivity, cyclic stars and toeffectively study the characteristics of the activity cycles on stars other thanthe Sun.