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N-body simulations have shown that the dynamical decay of the young (~1 Myr)Orion Nebula cluster could be responsible for the loss of at least half of itsinitial content of OB stars. This result suggests that other young stellarsystems could also lose a significant fraction of their massive stars at thevery beginning of their evolution. To confirm this expectation, we used theMid-Infrared Galactic Plane Survey (completed by the Midcourse Space Experimentsatellite) to search for bow shocks around a number of young ($\la$ severalMyr) clusters and OB associations. We discovered dozens of bow shocks generatedby OB stars running away from these stellar systems, supporting the idea ofsignificant dynamical loss of OB stars. In this paper, we report the discoveryof three bow shocks produced by O-type stars ejected from the open clusterNGC6611 (M16). One of the bow shocks is associated with the O9.5Iab starHD165319, which was suggested to be one of "the best examples for isolatedGalactic high-mass star formation" (de Wit et al. 2005, A&A, 437, 247).Possible implications of our results for the origin of field OB stars arediscussed.

Search for OB stars running away from young star clusters. I. NGC 6611