Abstract
In this paper, we have carried out photometric analysis and orbital period variation study of the contact binary EK Aqr. The Transiting Explanation Survey Satellite (TESS) light curves were analyzed by using Wilson–Devinney (W–D) program. Through the research, it is found that EK Aqr is an A-type low mass ratio median-contact binary (q = 0.192, f = 32.8%). A hot spot added on the primary component can model the asymmetric light curves. In addition, the TESS light curves exhibit continuous variation, which may be result from the position changes of the hot spot on the primary star. The absolute physical parameters were estimated by assuming the more massive primary component is a main-sequence star. Through O-C analysis, it is discovered that the orbital period is increasing, and the rate is (3.63 + 0.06)×10−7d/yr. The long-term increase of the period is due to the mass transfer from the less massive component to the more massive component. The evolutionary status of EK Aqr is analyzed, and the age of EK Aqr is also calculated.
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