Astron. Astrophys. 327, 1017-1022 (1997)

The GO Cygni system: a near contact eclipsing binary

H. Rovithis-Livaniou ¹, P. Rovithis ², G. Oprescu ³, A. Dumitrescu ³ and M.D. Suran <sup>3

1</sup> Section of Astrophysics, Astronomy & Mechanics, Dept. of Physics, University of Athens, GR-15784 Zografos, Greece
(e-mail: elivan@atlas.uoa.gr)
² Astronomical Institute, The National Observatory of Athens, P.O.Box 20048, GR-11810 Athens, Greece
³ Astronomical Institute, Academia Romana, Str. Cutitul d'Argint No.5, 75212 Bucharest 28, Romania

Received 2 February 1996 / Accepted 15 November 1996

Abstract

The GO Cygni system is a short period -0.7177 days- eclipsing binary with a Lyrae-type light curve. In this study our new BV photoelectric observations of the system, made at the Bucharest Observatory during 1993-94 are presented. These, and our old ones -made at the Kryonerion Astronomical Station of the National Observatory of Athens, Greece, in 1985- are analysed using Wood's program. The geometrical elements of the system -derived from the present analysis- correspond to a contact configuration suggesting that it belongs to the so-called near contact binaries. Moreover, its physical parameters lead to an unevolved system with both of its components located very close to the ZAMS. Finally, its orbital period is examined and found to show continuous increased.

Key words: stars: GO Cyg binaries: close-binaries: eclipsing

Send offprint requests to: H. Rovithis-Livaniou
Table 4 is only available in electronic form at the CDS (Strasbourg) via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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Contents

• 1. Introduction
• 2. The data
• 3. Light curves analysis procedure
• 4. Orbital period study
• 5. Summary, results and discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998
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