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Context. The origin, evolution, and ultimate fate of magnetic cataclysmicvariables are poorly understood. It is largely the nature of the magneticfields in these systems that leads to this poor understanding. Fundamentalproperties, such as the field strength and the axis alignment, are unknown in amajority of these systems. Aims. We undertake to put all the previous circularpolarization measurements into context and systematically survey intermediatepolars for signs of circular polarization, hence to get an indication of theirtrue magnetic field strengths and try to understand the evolution of magneticcataclysmic variables. Methods. We used the TurPol instrument at the NordicOptical Telescope to obtain simultaneous UBVRI photo-polarimetric observationsof a set of intermediate polars, during the epoch 2006 July 31 - August 2.Results. Of this set of eight systems two (1RXS J213344.1+510725 and 1RXSJ173021.5-055933) were found to show significant levels of circularpolarization, varying with spin phase. Five others (V2306 Cyg, AO Psc, DQ Her,FO Aqr, and V1223 Sgr) show some evidence for circular polarization andvariation of this with spin phase, whilst AE Aqr shows little evidence forpolarized emission. We also report the first simultaneous UBVRI photometry ofthe newly identified intermediate polar 1RXS J173021.5-055933. Conclusions.Circular polarization may be ubiquitous in intermediate polars, albeit at a lowlevel of one or two percent or less. It is stronger at longer wavelengths inthe visible spectrum. Our results lend further support to the possible linkbetween the presence of soft X-ray components and the detectability of circularpolarization in intermediate polars.

Circular polarization survey of intermediate polars I. Northern targets in the range 17h