Bvi Photometric Variability Survey of M3

We have conducted a three band (BV I) variability survey of the globular cluster M3. This is the first three band survey of the cluster using modern image subtraction techniques. Observations were made over 9 nights in 1998 on the 1.2 m. telescope at the F. L. Whipple Observatory in Arizona. We present photometry for 180 variable stars in the M3 field, of which 12 are newly discovered. New discoveries include six SX Phe type variables which all lie in the blue straggler region of the color magnitude diagram, three new first overtone RR Lyrae, two long period variables, and a detached eclipsing binary. We also provide revised periods for 52 of the 168 previously known variables that we observe. The catalog and photometry for the variable stars are available via anonymous ftp at ftp://cfa-ftp.harvard.edu/pub/kstanek/M3/. Subject headings: globular clusters: individual (M3) — binaries: eclipsing — delta Scuti — stars: variables: other — surveys