A Proper Motions Study of the Globular Cluster M12 (NGC 6218)
  Using astrometric techniques developed by Anderson et al., we determine
proper motions (PMs) in 14.60 arcmin X 16.53 arcmin area of the kinematically
"thick-disk" globular cluster M12. The cluster's proximity and sparse nature
makes it a suitable target for ground-based telescopes. Archive images with
time gap of 11.1 years were observed with wide-field imager (WFI) mosaic camera
mounted on ESO 2.2 m telescope. The median value of PM error in both components
is 0.7 mas/yr for the stars having V less than or equal to 20 mag. PMs are used
to determine membership probabilities and to separate field stars from the
cluster sample. In electronic form, a membership catalog of 3725 stars with
precise coordinates, PMs, BVRI photometry is being provided. One of the
possible applications of the catalog was shown by gathering the membership
information of the variable stars, blue stragglers and X-ray sources reported
earlier in the cluster's region.
