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We present results of a search for objects with H-alpha excess, such ascataclysmic variables (CVs) and chromospherically active binaries (ABs), ascounterparts to X-ray sources detected with Chandra satellite observatory insix Galactic globular clusters (GCs): M4, M28, M30, M71, M80, NGC 6752. Binarysystems play a critical role in the evolution of GCs, serving as an internalenergy source countering the tendency of GC cores to collapse. Theoreticalstudies predict dozens of CVs in the cores of some GCs (e.g., 130 for M28, 40for M30). A number of such binaries is also expected outside the core radius.However, few CVs are known so far in GCs. Using subtraction technique appliedto images taken with the 4.1-m SOAR telescope we have found 27 objects withH-alpha excess in the field of the observed clusters, of which nine are likelyassociated with the clusters. Four are candidate CVs, four candidate ABs, onecould be either a CV or an AB. One H-alpha object seems to be a backgroundgalaxy, while other 17 detected objects are probably foreground or backgroundstars.

H-alpha Imaging of X-ray Sources in Selected Globular Clusters with the SOAR Telescope