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Abstract: The binary YY Gem shows many interesting properties, one of which is theperiodicity in its flaring rate. The period, which is about $48 \pm 3$ min, wasever interpreted in terms of the oscillation of a filament. In this paper, wepropose a new model to explain this phenomenon by means of 2.5-dimensional MHDnumerical simulations. It is found that magnetic reconnection is induced as thecoronal loops rooted on both stars inflate and approach each other, which isdriven by the differential stellar rotation. The magnetic reconnection ismodulated by fast-mode magnetoacoustic waves which are trapped between thesurfaces of the two stars, so that the reconnection rate presents a periodicbehaviour. With the typical parameters for the binary system, the observedperiod can be reproduced. We also derive an empirical formula to relate theperiod of the flaring rate to the coronal temperature and density, as well asthe magnetic field.

Autor: D. H. Gao, P. F. Chen, M. D. Ding, X. D. Li


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