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Variable Stars in the Archival HST Data of Globular Clusters M13, M30 and NGC 6712

Pietrukowicz P., Kaluzny J.

Acta Astronomica

2004

Vol. 54, No. 1

19--31

We have analyzed archival HST/WFPC2 time-series data of the central parts of globular clusters M13, M30 and NGC 6712 in search for variable objects. Among a total of 21 identified variables there are 15 new discoveries. The sample includes nine RR Lyr stars, two SX Phe stars and seven W UMa-type contact binaries. One object is preliminarily classified as a detached eclipsing binary and another as an ellipsoidal variable.