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Astron. Astrophys. 325, 994-1000 (1997)

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S 10932 Comae - a jumping jack among the cataclysmic variables

G.A. Richter 1, P. Kroll 1, J. Greiner 2, 3, W. Wenzel 1, R. Luthardt 1 and R. Schwarz 2

1 Sternwarte Sonneberg, D-96515 Sonneberg, Germany
2 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
3 Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, Germany

Received 3 March 1997 / Accepted 18 March 1997


We analyse photometric and spectroscopic observations of the optical counterpart of the X-ray source RX J1239.5+2108 (hereafter named S 10932 Comae Berenices), which proved to be a nova-like variable with deep eclipsing minima. It is variable on a variety of timescales. In addition to a "normal brightness state", in which S 10932 spends most of its time, there are eruption states (like in dwarf novae) as well as low states, more than 1 mag fainter than the normal state. In many respects, its optical behaviour resembles that of an intermediate polar. But besides the orbital period of [FORMULA] we did not find any other periodicity which could be ascribed to the rotation of the white dwarf (the main criterion of an object to be an intermediate polar).

Key words: stars: variable: others – X-rays: stars – stars: novae, cataclysmic variables

Send offprint requests to: J. Greiner, jgreiner@aip.de

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998