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This is the first step in a project to combine studies of eclipsing binariesand oscillating stars to probe the interior of Blue Stragglers (BS). This mayimply a way to discriminate observationally between different birth mechanismsof BS stars. We study the open cluster NGC2506 which contains oscillating BSstars and detached eclipsing binaries for which accurate parameters can bederived. This will tightly constrain the cluster isochrone and provide anabsolute mass, radius and luminosity-scale for the cluster stars along with thecluster age, metallicity and distance. The present work focuses on obtainingthe light curves of the binaries and determine their orbital periods, onobtaining power spectra of the oscillating BS stars to select targets forfollow-up studies, and on searching for gamma Doradus type variables which arealso expected to be present in the cluster. With a two-colour, dual-sitephotometric campaign we obtained 3120 CCD-images of NGC2506 spread over fourmonths. We analysed the BI time-series of the oscillating stars and usedsimulations to derive statistical uncertainties of the resulting frequencies,amplitudes and phases. A preliminary mode-identification was performed usingfrequency ratios for the oscillating BS stars, and amplitude ratios and phasedifferences for a population of newly detected gamma Doradus stars. Wequadrupled the number of known variables in NGC2506 by discovering 3 newoscillating BS stars, 15 gamma Doradus stars and four new eclipsing binaries.The orbital periods of 2 known, detached eclipsing binaries were derived. Wediscovered a BS star with both p-mode and g-mode variability and we confrontedour gamma Doradus observations with state-of-the-art seismic models, but foundsignificant discrepancy between theory and observations.Comment: 17 pages, 20 figures, accepted for publication in A&

Oscillating blue stragglers, γDoradus stars and eclipsing binaries in the open cluster NGC 2506