CCD photometry of faint variable stars in the globular cluster NGC 6752

We present the results of a photometric survey for variable stars in the held of the nearby globular cluster NGC 6752. The cluster was monitored in 1996 and 1997 for a total of 54 hr with three different CCD cameras mounted on the 1.0 m Swope Telescope. Eleven new variables were identified: three SX Phoenicis stars, seven contact binaries, and one candidate detached eclipsing binary. All three SX Phoenicis variables are likely members of the cluster, while only one out of the seven contact binaries is a potential cluster member. As a by-product of our survey, we obtained UBV photometry for a large sample of stars in the cluster field. Two stars with U-B approximate to -1.0 and V = 19.3 and V = 20.6 were identified. They lie along the extended horizontal branch of the cluster and are likely to be faint sdB stars from NGC 6752.