A search for new variable stars in NGC6231

NGC6231 is a well-studied young open cluster hosting several variable stars . In the field six beta Cephei stars, several eclipsing binaries and one de lta Scuti star are known (as well as a foreground delta Scuti star). In an ongoing effort to map and study the variability in NGC6231, we present new results based on CCD time-series data optimised for the bright beta Cephei stars as well as data optimised for much fainter stars. We detect 17 new va riable stars in the cluster, including three delta Scuti stars, three gamma Doradus candidates, three Slowly Pulsating B star candidates and one, or p ossibly two, new beta Cephei stars.