Activity cycles and Maunder minima stars

We propose to continue monitoring three fields containing a total of fivelatetype stars for longterm variability. The stars are 61 Cyg A and B, HD 81809, all of which are being monitored for Ca emission, with 61 Cyg A andHD 81809 having cyclic activity changes, and Alpha Cen A and B, the nearestsolarlike star. All of these stars are known Xray sources, which have alreadybenn monitored in XMMNewton AO1. The overall goal of this series ofobservations is to obtain a baseline of a decade for these objects in order tocheck whether other solar like stars show cyclic changes in their Xray outputjust like the Sun. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]