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Astron. Astrophys. 325, 994-1000


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S 10932 Comae - a jumping jack among the cataclysmic variables

G.A. Richter1, P. Kroll1, J. Greiner2,3, W. Wenzel1, R. Luthardt1, and R. Schwarz2

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

Abstract

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 2h 05m 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


© European Southern Observatory (ESO) 1997

Online publication: September 9, 1997
Last change: April 28, 1998
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