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Astron. Astrophys. 341, 799-802 (1999)

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AU Serpentis and FG Hydrae: two contact binaries with sudden variations in their orbital periods

Qian Shengbang, Liu Qingyao and Yang Yulan

Yunnan Observatory, Chinese Academy of Sciences, Kunming, P.R. China (e-mail: bily@public.km.yn.cn)

Received 22 April 1998 / Accepted 27 August 1998


Many available published times of light minima of the two contact binaries AU Ser and FG Hya are collected and the changes in their orbital periods are analyzed. It is indicated that the orbital period of AU Ser shows a sudden decrease in the time interval of 1987-1988 and several period jumps are found in FG Hya. The connections between the period jumps and the variable O'Connell effects (asymmetries in the light curves) of the two contact binaries are also discussed.

Key words: stars: binaries: close – stars: individual: AU Ser – stars: individual: FG Hya

Send offprint requests to: Qian Shengbang

© European Southern Observatory (ESO) 1999

Online publication: December 16, 1998