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Context: the observation of young stars with circumstellar disks suggeststhat the disks are dissipated, starting from the inner region, by the radiationof the central star and eventually by the formation of rocky planetesimals,over a time scale of several million years. It was also shown that strong UVradiation emitted by nearby massive stars can heat a circumstellar disk up tosome thousand degrees, inducing the photoevaporation of the gas. This processstrongly reduces the dissipation time scale. Aims: we study whether thereexists a correlation between the spatial distribution of stars withcircumstellar disks and the position of massive stars with spectral classearlier than B5, in the open cluster NGC 6611. Methods: we created a multibandcatalog of the cluster, down to V~23, using optical data from a WFI observationat 2.2m of ESO in the BVI bands, the 2MASS public point source catalog and anarchival X-ray observation made with CHANDRA/ACIS. We selected the stars withinfrared excess (due to the emission of a circumstellar disk) using suitablecolor indices independent of extinction, and studied their spatialdistribution. Results: the spatial distribution of the stars with K band excess(due to the presence of a circumstellar disk) is anti correlated with that ofthe massive stars: the disks are more frequent at large distances from thesestars. We argue that this is in agreement with the hypothesis that thecircumstellar disks are heated by the UV radiation from the massive stars andphotoevaporated.

Correlation between the spatial distribution of circumstellar disks and massive stars in the open cluster NGC 6611