The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

作     者：Ravi Raja Pothuneni Shanti Priya Devarapalli Rukmini Jagirdar Ravi Raja Pothuneni;Shanti Priya Devarapalli;Rukmini Jagirdar

作者机构：Department of AstronomyOsmania University500007India 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2023年第23卷第2期

页      面：205-222页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Funding for the project has been provided by the National Development and Reform Commission 

主　　题：(stars:)binaries eclipsing-(stars:)binaries(including multiple) close-stars evolution-techniques photometric-techniques spectroscopic-stars activity 

摘      要：The first photometric,spectroscopic and period variation studies of neglected short-period eclipsing binary V2840Cygni are *** mass ratio contact binaries(HMRCBs),especially those in the weak-contact configuration,are vital when probing the evolutionary models of contact binaries(CBs) using stellar *** photometric solutions reveal the weak-contact nature of V2840 Cygni with a high mass ratio(~1.36),motivating us to investigate the nature of such *** period variation study of V2840 Cygni spanning 15 yr shows a secular period decrease at a rate of ~5.5 × 10^(-7) day yr^(-1),indicating mass transfer between the *** superimposed cyclic variation provides a basic understanding of the possible third body(P_(3)- 8 yr,m_(3)- 0.51 M_(⊙)).Following the derived parameters,the evolution of the system is discussed based on the thermal relaxation oscillation(TRO) *** is found that V2840 Cygni falls in a special category of HMRCBs,which validates *** characterize the nature of HMRCBs,a catalog of 59 CBs with high mass ratios has been compiled along with their derived parameters from the *** all the HMRCBs in the study,a possible correlation between their contact configuration and observed period variations for relative log J_(rel) is *** spectroscopic study of V2840 Cygni provides evidence of the presence of magnetic activity in the system and the existence of ongoing mass transfer which is additionally deduced from the period variation *** LAMOST spectra of 17 HMRCBs are collected to interpret the stellar magnetic activity in such systems.