First photometric investigations of three eclipsing binaries: AST19571, AST21541, and AST38503

• Published in: New Astronomy
• Main Authors: Shi XD(施相东), Qian SB(钱声帮), Zhang J(张嘉), Soonthornthum, Boonrucksar, Sarotsakulchai, Thawicharat, Zhou X(周肖)
• Format: Article in Journal/Newspaper
• Language: English
• Published: ELSEVIER SCIENCE BV 2019
• Subjects: Close-binaries; Eclipsing-binaries; Individual (AST19571 AST21541 and AST38503); 天文学; 天文学::恒星与银河系; 天文学::恒星与银河系::恒星天文学; 理学; 理学::天文学; Astronomy & Astrophysics; LIGHT; STARS; Antarc*; Antarctica
• Online Access: http://ir.ynao.ac.cn/handle/114a53/20557; http://ir.ynao.ac.cn/handle/114a53/20558; https://www.sciencedirect.com/science/article/pii/S1384107619301186?via%3Dihub; https://doi.org/10.1016/j.newast.2019.04.007

AST3-1 is the second-generation optical photometric telescope at Dome A in Antarctica. In this study, photometric solutions of three eclipsing binaries comprising AST19571, AST21541, and AST38503 were determined for the first time using the light curves obtained with AST3-1. The light curves for the three binaries in the Galactic disk field were analyzed with the Wilson-Devinney method. We found that AST19571 and AST21541 are intermediate-contact binary systems with fill-out factors of f = 39.9(+/- 5.4) % and 36.4(+/- 4.7) %, respectively, and their mass ratios were determined as q = 0.275(+/- 0.0034) and 0.25(+/- 0.0024). AST38503 was shown to be a deep-contact binary system with a degree of contact of f = 66(+/- 33)% and a mass ratio of q = 0.314(+/- 0.03). Some light minimum times were derived for the three contact binary stars. The results showed that the period of AST19571 is increasing at a rate of dp/dt = +4.71 x 10(-7). This increase in the period could be explained by mass transfer between the components. The absolute parameters were estimated for the components of the three binaries.