Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..994r&link_type=abstract
Astronomy and Astrophysics, v.325, p.994-1000
Other
7
Stars: Variable: Others, X-Rays: Stars, Stars: Novae, Cataclysmic Variables
Scientific paper
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 2^h^05^m^ 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).
Greiner Jochen
Kroll Peter
Luthardt R.
Richter Gerold A.
Schwarz Ralf
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