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We present a photometric and spectroscopic study of the blue straggler S1082in the open cluster M67. Our observations confirm the previously reported 1.07day eclipse light curve and the absence of large radial-velocity variations ofthe narrow-lined star. However, we find two more spectral components which dovary on the 1.07 day period. We conclude that the system is triple. We fit thelight and radial-velocity curves and find that the total mass of the innerbinary is more than twice the turnoff mass and that the outer companion to thebinary is a blue straggler on its own account. We briefly discuss formationscenarios for this multiple system.Comment: accepted by A&A, 12 pages, 11 figure

The blue straggler S 1082: A triple system in the old open cluster M 67