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Aims: We analyze INTEGRAL-ISGRI data in order to probe the hard X-rayemission (above 20 keV) from point sources in the Cyg OB2 region and toinvestigate the putative non-thermal high-energy emission from early-type stars(Wolf-Rayet and O-type stars). Among the targets located in the field of view,we focus on the still unidentified EGRET source 3EG 2033+4118 that may berelated to massive stars known to produce non-thermal emission in the radiodomain, and on the wide colliding-wind binary WR 140. Methods: Using a largeset of data obtained with the IBIS-ISGRI imager onboard INTEGRAL, we run theOSA software package in order to find point sources in the fully coded field ofview of the instrument. Results: Our data do not allow the detection of alower-energy counterpart of 3EG J2033+4118 nor of any other new point sourcesin the field of view, and we derive upper limits on the high-energy flux for afew targets: 3EG J2033+4118, TeV J2032+4130, WR140, WR146 and WR147. Theresults are discussed in the context of the multiwavelength investigation ofthese objects. Conclusions: The upper limits derived are valuable constraintsfor models aimed at understanding the acceleration of particles in non-thermalemitting massive stars, and of the still unidentified very-high gamma-raysource TeV J2032+4130.

astronomy and astrophysics

INTEGRAL-ISGRI observations of the CygOB2 region: earching for hard  X-ray point sources in a region containing several non-thermal emitting  massive stars