A photometric study of a total-eclipse contact binary V458 Mon

• Published in: New astronomy 2024-10, Vol.111, p.102250, Article 102250
• Main Authors: Zubairi, Ahmed Waqas, Ergang, Zhao, He, Jiajia, Li, Fuxing, Zhu, Liying, Matekov, Azizbek
• Format: Article
• Language: English
• Subjects: Binaries; Eclipsing – stellar; Evolution – individual; V458 Mon
• ISSN: 1384-1076; 1384-1092
• DOI: 10.1016/j.newast.2024.102250

We present light curve solution of V458 Mon firstly by using the Wilson-Devinney code. The total eclipse and deep minima of the light curves of V458 Monenable us to determine reliable orbital parameters of the binary system. The solution suggests that V458 Monis a low mass ratio binary system with about 0.2 possessing a moderate degree of contact. The long-term period investigation showed that the period of V458 Monis increasing at dP/dt=+2.59×10−7days/yr, which could be the reason of mass transfer from the less massive component to more massive primary one, together with a periodic change. The oscillation in orbital period may be due to an unseen tertiary companion with the mass about M3=1.8M⊙ . After removing these change, there is still a weak cyclic change maybe due to magnetic activity. With the increase in orbital period of binary, the separation increases and mass ratio decreases which eventually leads V458 Montowards merger. •The first light curves from TESS were analyzed by using Wilson-Devinney code.•The Photometric solution discovered V458 Mon is a low mass-ratio contact binary.•The orbital period is extended to more than 100 years by using DASCH. A long-term increasing together with two periodic changes were determined.•The mass transfer due to period increasing is calculated and the third body infer from main periodic change are estimated to be a compact star and magnetic activity may be the reason of weak cyclic change.