BSN:Photometric Light Curve Analysis of Two Contact Binary Systems LS Del and V997 Cyg  

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作  者:Atila Poro Mehmet Tanriver Elham Sarvari Shayan Zavvarei Hossein Azarara Laurent Corp Sabrina Baudart Asma Ababafi Nazanin Kahali Poor Fariba Zare Ahmet Bulut Ahmet Keskin 

机构地区:[1]Astronomy Department of the Raderon AI Lab.,Burnaby,BC.,Canada [2]Department of Astronomy and Space Science,Faculty of Science,Erciyes University,Kayseri TR-38039,Turkiye [3]Erciyes University,Astronomy and Space Science Observatory Application and Research Center,Kayseri TR-38039,Turkiye [4]Independent Astrophysics Researcher,Tehran,Iran [5]Department of Physics,Shahid Beheshti University,Tehran,Iran [6]Faculty of Physics,Shahid Bahonar University of Kerman,P.O.Box 76175,Kerman,Iran [7]Double Stars Committee,SociétéAstronomique de France,Paris,France [8]Dez Astronomical Association,Khouzestan Province,Dezful,Iran [9]Department of Physics,Amirkabir University of Technology,Tehran,Iran [10]Department of Physics,Faculty of Sciences,Canakkale Onsekiz Mart University,Terzioglu Kampusu,TR-17020,Canakkale,Turkiye [11]Astrophysics Research Center and Observatory,Canakkale Onsekiz Mart University,Terzioğlu Kampusu,TR-17020,Canakkale,Türkiye

出  处:《Research in Astronomy and Astrophysics》2024年第4期192-213,共22页天文和天体物理学研究(英文版)

基  金:project was supported by the Scientific Research Projects Coordination Unit of Erciyes University(project number FBA-2022-11737);the TESS mission is provided by the NASA Explorer Program。

摘  要:The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the targe systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt=7.20×10^(-08)days yr^(-1)and dP/dt=2.54×10^(-08)days yr^(-1),respectively Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96×10^(-7)M_(⊙)yr^(-1)for the LS Del system,and dM/dt=-3.83×10^(-7)M_(⊙)yr-1for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima.The mass ratio fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R q-L_(ratio),and logM_(tot)-logJ_(0)diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.

关 键 词:(stars:)binaries:eclipsing methods:observational stars:individual(LS Del and V997 Cyg) 

分 类 号:O17[理学—数学]

 

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