V0644 Ser:An Active Ultrashort Period Contact Binary Star

作     者：Hu-Shan Xu Li-Ying Zhu Sarotsakulchai Thawicharat Soonthornthum Boonrucksar Hu-Shan Xu;Li-Ying Zhu;Sarotsakulchai Thawicharat;Soonthornthum Boonrucksar

作者机构：Yunnan ObservatoriesChinese Academy of Sciences(CAS)Kunming 650216China University of the Chinese Academy of SciencesBeijing 100049China Key Laboratory of the Structure and Evolution of Celestial ObjectsChinese Academy of SciencesKunming 650216China National Astronomical Research Institute of Thailand191 Siriphanich Bldg.Huay Kaew Rd.Chiang Mai 50200Thailand 

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

年 卷 期：2022年第22卷第3期

页      面：252-262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：supported by the National Natural Science Foundation of China(Nos.11922306 and 11933008) 

主　　题：(stars:)binaries(including multiple):close (stars:)binaries:eclipsing stars:late-type stars:individual(V0644 Ser) 

摘      要：The photometric solutions of the ultrashort period close binary V0644 Ser based on our new complete BVRI light curves are derived by the Wilson–Devininney *** results show that V0644 Ser is a W-type shallow contact binary,and the third light was found in the R and I *** with the light curves in 2011,the amplitude variation of the secondary maximum can be explained by the temperature change from hot to cold in the local region of the star surface caused by magnetic activity or convective *** with the Gaia parallax,the absolute parameters of this system are obtained:M_(1)=0.29(4)M_(⊙),R_(1)=0.48(3)R_(⊙),R_(2)=0.65(3)R_(⊙),L_(1)=0.11(2)L_(⊙),L_(2)=0.16(2)L_(⊙)=0.16(2)L_(⊙).To study the period variation,we fitted the Super WASP,CSS,ASAS-SN and ZTF survey timing data to obtain light minima times spanning 14 *** O-C analysis,we find that the orbital period of this system has a long-term period decrease and periodic *** long-term period decrease can be explained by the mass transfer from more-massive component to less one and angular momentum loss via magnetic stellar *** the period decrease,this system is evolving from the present shallow contact phase to a relatively deeper stage predicted by the thermal relaxation oscillation *** oscillation can be explained by the light-time effect of the cool third *** third body may play an important role in the early formation and evolution of the binary system by removing angular momentum.