S-10932 COMAE - A JUMPING JACK AMONG THE CATACLYSMIC VARIABLES

We analyse photometric and spectroscopic observations of the optical c ounterpart of the X-ray source RX J1239.5+2108 (hereafter named S 1093 2 Comae Berenices), which proved to be a nova-like variable with deep eclipsing minima. It is variable on a variety of timescales. In additi on to a ''normal brightness state'', in which S 10932 spends most of i ts time, there are eruption states (like in dwarf novae) as well as lo w states, more than 1 mag fainter than the normal state. In many respe cts, its optical behaviour resembles that of an intermediate polar. Bu t besides the orbital period of 2(h) 05(m) we did not find any other p eriodicity which could be ascribed to the rotation of the white dwarf (the main criterion of an object to be an intermediate polar).