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We present a study based on more than 2500 uvby-measurements collected on HD172189, a new eclipsing binary system with a Delta Sct-type pulsating componentthat belongs to the open cluster IC 4756. The great interest of this objectlies in that three important characteristics coexist: cluster membership,binarity and pulsation. Its binarity and the Delta Sct-type pulsations of onecomponent were detected in the course of several Stromgren photometriccampaigns. The frequency analysis of all the uvby out-of-eclipse data reveals aclear frequency of 19.5974 c/d as well as the existence of other high values inthe range 18-20 c/d. We have also carried out a first evaluation of the binaryparameters and determined a value of 5.702 d for the orbital period. Anadditional potential interest of HD 172189 resides in its location in the fieldof view of the COROT mission and, therefore, this star is an excellentcandidate for becoming a target for asteroseismology.Comment: 4 pages, 3 figures, accepted by A&

HD 172189: an eclipsing and spectroscopic binary with aδ Sct-type pulsating component in an open cluster