Vol 18, No 3

First photometric study of ultrashort-period contact binary 1SWASP J140533.33+114639.1

Bin Zhang, Sheng-Bang Qian, Ri Michel, Boonrucksar Soonthornthum, Li-Ying Zhu


Abstract In this paper, CCD photometric light curves for the short-period eclipsing binary 1SWASP J140533.33+114639.1 (hereafter J1405) in the BVR bands are presented and analyzed using the 2013 version of the Wilson-Devinney (W-D) code. It is discovered that J1405 is a W-subtype shallow contact binary with a contact degree of f = 7.9 ± 0.5% and a mass ratio of q = 1.55 ± 0.02. In order to explain the asymmetric light curves of the system, a cool starspot on the more massive component is employed. This shallow contact eclipsing binary may have been formed from a short-period detached system through orbital shrinkage due to angular momentum loss. Based on the (O − C) method, the variation of orbital period is studied using all the available times of minimum light. The (O − C) diagram reveals that the period is increasing continuously at a rate of dP/dt = +2.09 × 10−7 d yr−1, which can be explained by mass transfer from the less massive component to the more massive one.


Keywords stars: binaries: close — stars: binaries: eclipsing — stars: individual (1SWASP J140533.33+114639.1)

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