Results of the optical identification of the hard X-ray source IGR J08390–4833 recently
discovered in the INTEGRAL all-sky survey are presented. We show that the source is most likely a
cataclysmic variable, i.e., an accreting white dwarf in a binary. Analysis of its optical light curve clearly
reveals intrinsic variability on timescales of the order of an hour or longer. However, the short time
of the source’s optical observations does not allow a definitive conclusion about the periodicity of the
detected variability to be reached. Further optical and X-ray observations are required for a more accurate
classification of the source.

EB00000003840K

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• Optical Identification of the Source IGR J08390–4833 from the INTEGRAL All-Sky Survey