Maunder minimum stars: How frequent are they questionMark

The exceptional low activity of the Sun during the Maunder minimum periodbetween 1650 1715 is still an unsolved astrophysical puzzle; the appearance ofsolar activity during that period is of major interest both for solar physicistsand climatologists. Searches for stellar analogs of the Maunder minimum Sun havehad only mixed success and it is controversial how common Maunder minimum starsreally are. We propose to carry out a sensitive Xray survey of extremely lowactivity stars in the immediate solar neighborhood to investigate whether thesestars are ..flatactivity.. objects or show cyclic behavior similar to the Sun. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]