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Abstract:
We derive relative proper motions of stars in the fields of globular clusters
M4, M12, M22, NGC 3201, NGC 6362 and NGC 6752 based on
a uniform data set collected between 1997 and 2008. We assign a membership
class for each star with a measured proper motion, and show that these
membership classes can be successfully used to eliminate field stars from
color-magnitude diagrams of the clusters. They also allow for the efficient
selection of rare objects such as blue/yellow/red stragglers and stars from
the asymptotic giant branch. Tables with proper motions and photometryof
over 87000 stars are made publicly available via the Internet.
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