First catalogue of variable sources observed by OMC onboard INTEGRAL

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The Optical Monitoring Camera (OMC) onboard INTEGRAL provides photometry in the V Johnson band. With an aperture of 50 mm and a field of view of 5 deg x 5 deg, OMC is able to detect optical sources brighter than around V ˜ 18, from a previously selected list of potential targets of interest. After more than seven years of observations, the OMC data base contains now light-curves for more than 60,000 sources (with more than 50 photometric points each). In order to detect potential variability, we have performed a chi^2 test, finding 5653 variable sources out of a sample of 6681 objects with good photometric quality and more than 300 data points each. Finally we have studied the potential periodicity of these sources using a method based on the phase dispersion minimization technique. In thisfirst catalogue of variable sources observed by OMC, we provide for each object the median of the visual magnitude, the amplitude of the light curve during the window of observations and the period, when found, as well as the complete intrinsic and period-folded light curves.

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