New variable stars in NGC 6652 and its background Sagittarius stream
  We conducted a variable star search on the metal-rich Galactic globular
cluster NGC 6652 using archival Gemini-S/GMOS data. We report the discovery of
nine new variable stars in the NGC 6652 field, of which we classify six as
eclipsing binaries and one as SX Phoenicis stars, leaving two variables without
classification. Using proper motions from Gaia DR2 and HST, albeit with some
uncertainties, we find that the cluster, the field, and the background
Sagittarius stream, have 3 of these variables each. We also reassess the
membership of known variables based on the Gaia proper motions, confirming the
existence of one RR Lyrae star in the cluster.
