The new pre-cataclysmic binary PG 2200+085

¹ Kazan State University, Kremlevskaja Str., 18, 420008 Kazan, Russia e-mail: Slava.Shimansky@ksu.ru
² Tatarstan Academy of Science, Baumana Str. 20, 420111 Kazan, Russia
³ Kazan Branch of Isaac Newton Institute, Santiago, Chile
⁴ Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching, Germany
⁵ Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
⁶ Special Astrophysical Observatory, 369167 Nizhnij Arkhyz, Russia
⁷ Department of Theoretical Physics, Tatar State Humanitarian Pedagogical University, Tatarstan Str. 2, 420021 Kazan, Russia

Received: 6 March 2006
Accepted: 24 April 2006

Abstract

Aims.We present the results of spectroscopic- and orbit-sampled photometric observations of the faint UV-excess object PG 2200+085.

Methods.The optical CCD photometry observations of this object were performed by the Russian-Turkish 1.5-m telescope RTT150 at the TUBITAK National Observatory (Turkey). The long-slit optical spectroscopy observations with 2.6 Å resolution were carried out by 6-m telescope BTA at the Special Astrophysical Observatory (Russia).

Results.The photometric variations over two nights are almost sinusoidal with an amplitude and a period of  d. Such a light curve is typical of a detached close binary with an illumination effect or the ellipsoidal deformation of a secondary star. The observed spectrum clearly displays a featureless blue continuum of a hot component and a rich absorption-line and molecular band K-star spectrum. The CaII line profiles with strong emission cores are remarkably similar to those of V471 Tau.

Conclusions.We tentatively classify PG 2200+085 as a pre-cataclysmic binary of the V471 Tau type.