Vol 20, No 4

1SWASP J034439.97+030425.5: a short-period eclipsing binary system with a close-in stellar companion

Bin Zhang, Sheng-Bang Qian, Jing-Jing Wang, Qi-Jun Zhi, Ai-Jun Dong, Wei Xie, Li-Ying Zhu, Lin-Qiao Jiang


Abstract First multi-wavelength photometric light curves (LCs) of the short-period eclipsing binary (EB) 1SWASP J034439.97+030425.5 (hereafter J0344) are presented and analyzed by using the 2013 version of the Wilson-Devinney (W-D) code. To explain the asymmetric LCs of J0344, a cool star-spot on the less massive component was employed. The photometric solutions suggest that J0344 is a W-subtype shallow contact EB with a contact degree of f = 4.9% ± 3.0% and a mass ratio of q = 2.456 ± 0.013. Moreover, an obvious third light was detected in our analysis. We calculated the average luminosity contribution of the third light to the total light, and that value reaches up to 49.78%. Based on the O − C method, the variations of the orbital period were studied for the first time. Our O − C diagram reveals a secular decrease superimposed on a cyclic oscillation. The orbital period decreases at a rate of dP/dt = −6.07 × 10−7 d yr−1, which can be explained by the mass transfer from the more massive component to the less massive one. Besides, its O − C diagram also shows a cyclic oscillation with an amplitude of 0.0030 d and a period about 7.08 yr, which can be explained by the presence of a third body with a minimum mass of M3min = 0.15 ± 0.02 M⊙. The third component may play an important role in the formation and evolution of J0344 by drawing angular momentum from the central system.


Keywords stars: binaries: close — stars: binaries: eclipsing — stars: individual (1SWASP J034439.97+030425.5)

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