ar X iv : a st ro - p h / 07 03 69 3 v 1 2 7 M ar 2 00 7 Contact binaries with additional components . III . The
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چکیده
We present results of the CFHT adaptive optics (AO) search for companions of a homogeneous group of contact binary stars, as a contribution of our attempts to prove a hypothesis that these binaries require a third star to become so close as observed. The data were obtained on two nights in 1998 and two nights in 2005. In addition to companions directly discovered at separations of 1 − 10 separations, we introduced a new method of AO image analysis to analyze distortions of the AO diffraction ring pattern at separations of 0.07 − 1. Very close companions, with separations in the latter range were discovered in systems HV Aqr, OO Aql, CK Boo, XY Leo, BE Scl, and RZ Tau. More distant companions were detected in V402 Aur, AO Cam, V2082 Cyg. Our results provide a contribution to the mounting evidence that the presence of close companions is a very common phenomenon for very close binaries with orbital periods < 1 day. Subject headings: stars: close binaries stars: eclipsing binaries – stars: variable stars
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