EDP Sciences
Free access
Volume 423, Number 2, August IV 2004
Page(s) 607 - 611
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:200400017

A&A 423, 607-611 (2004)
DOI: 10.1051/0004-6361:200400017

A study of the EB-type eclipsing binary GR Tauri with mass transfer

Sheng-hong Gu1, 2, Pei-sheng Chen1, 2, Yu-kou Choy2, Kam-cheung Leung3, Wai-keung Chung3 and Tak-sun Poon3

1  National Astronomical Observatories/Yunnan Observatory, Joint laboratory for optical astronomy, Chinese Academy of Sciences, Kunming, PR China
    e-mail: shenggu@public.km.yn.cn
2  Ho Koon Nature Education cum Astronomical Centre, Sik Sik Yuen, Hong Kong, PR China
3  Hong Kong Astronomical Society, Hong Kong, PR China

(Received 21 December 2001 / Accepted 10 May 2004 )

In this paper, new CCD BV light curves of the EB-type eclipsing binary GR Tau, which were obtained in 1999, are analyzed by means of the Wilson-Devinney program. The photometric solution of this system is obtained, and its absolute parameters are also derived. Our study has demonstrated that GR Tau is a near-contact binary system with an almost-contact semidetached configuration in which the primary fills its Roche lobe, and both components are main-sequence stars. The asymmetric shape of the light curves can be explained by a hot spot on the surface of the secondary, which is created by the mass transfer from the primary to the secondary. GR Tau belongs to the V1010 Oph subclass of near-contact binaries, and is a good example of a system in the broken-contact phase predicted by the TRO theory.

Key words: stars: binaries: close -- stars: individual: GR Tau

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