A ground-based proper motion study of twelve nearby Globular Clusters
  We derive relative proper motions of stars in the fields of the globular
clusters M12, NGC 6362, M4, M55, M22, NGC 6752, NGC 3201, M30, M10, NGC 362,
M5, and 47 Tucanae based on data collected between 1997 and 2015 with the 1-m
Swope telescope of Las Campanas Observatory. We determine membership class and
membership probability for over 446 000 objects, and show that these are
efficient methods for separating field stars from members of the cluster. In
particular, membership probabilities of variable stars and blue/yellow/red
stragglers are determined. Finally, we find absolute proper motions for six
globular clusters from our sample: M55, NGC 3201, M10, NGC 362, M5, and 47 Tuc.
An electronic catalogue of the derived proper motions is publicly available via
the internet.
