Coronal activity cycles in solar analog stars

We propose to pursue a longterm monitoring program of a selection of solartypestars all of which show clear to the solar cycle in their CaII flux, with theaim of detecting and studying, for the first time in Xrays, the presence ofactivity cycles in stars other than the Sun. Thus far only very active stars not show CaII cycles but only irregular variability have monitored with asufficient time base in Xrays, with no evidence for cycles. XMM makes itpossible, for the first time, to efficiently monitor the lowactivity, cyclicstars which are the true analogues of thus to effectively constrain thecharacteristics of the cycles on stars other than the Sun. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]