Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems

doi:10.1093/mnras/stz715

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	Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems
	Gao, Dong-Yang 4; Chen, Xu 4; Gao, Xing 1; Guo, Di-Fu 4; Hu, Shao-Ming 4; Michel, Raul 2; Xia, Qi-Qi 4; Li, Kai 3,4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2019-06-01
卷号	485 期号:4 页码:4588-4600
关键词	binaries: close binaries: eclipsing stars: evolution stars: statistics
ISSN号	0035-8711
DOI	10.1093/mnras/stz715
通讯作者	Li, Kai(kaili@sdu.edu.cn)
英文摘要	The period distribution of contact binaries exhibits a very sharp short period cut-off at 0.22 d. In order to provide valuable information on this short period limit, we observed 10 totally eclipsing contact binaries with orbital periods near this cut-off. By detailed analysis using the W-D code, we determined that two of these systems are A-subtype contact binaries while the others areW-subtype contact binaries and all the targets show shallow contact configurations. Half of the targets exhibit stellar spot activity and four of them have third light. A statistical work on well-studied ultrashort period contact binaries (USPCBs) was carried out, and physical parameters of 55 USPCBs were obtained. Some common properties for these systems were derived. Due to the study of the period-colour diagram of USPCBs, we found that the period-colour relation of USPCBs is different from other W UMa type contact binaries and USPCBs are metal-poor old stars. In addition, the evolutionary states of these systems were discussed by constructing the colour-density diagram. We derived that the evolutionary states of the two components of USPCBs show identical characteristics of other contact binaries despite a slower evolutionary status caused by smallermass. We suggested that both the fully convective limit claimed by Rucinski and the angular momentum loss theory recommended by Stepien can produce the short period cut-off and a tertiary companion is very important during the formation of the short period contact binaries by removing angular momentum from the host eclipsing pairs under certain circumstances.
资助项目	Chinese Natural Science Foundation[11703016] ; National Natural Science Foundation of China (NSFC)[U1431105] ; Chinese Academy of Sciences (CAS)[U1431105] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Natural Science Foundation of Shandong Province[ZR2017PA009] ; Natural Science Foundation of Shandong Province[ZR2017PA010] ; Natural Science Foundation of Shandong Province[JQ201702] ; Young Scholars Program of Shandong University, Weihai[20820162003] ; Young Scholars Program of Shandong University, Weihai[20820171006] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201704] ; project UNAM PAPIIT[IN100918] ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; National Development and Reform Commission ; WHOT
WOS关键词	LIGHT-CURVE SOLUTIONS ; STAR LIGHT ; EVOLUTIONARY STATE ; VARIABLE-STARS ; MASS ; CATALOG ; LIMIT ; VELOCITY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000474880400012
资助机构	Chinese Natural Science Foundation ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Natural Science Foundation of Shandong Province ; Young Scholars Program of Shandong University, Weihai ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects ; project UNAM PAPIIT ; Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences ; National Development and Reform Commission ; WHOT
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/2884]
专题	研究单元未命名
通讯作者	Li, Kai
作者单位	1.Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China 2.Univ Nacl Autonoma Mexico, Inst Astron, Observ Astron Nacl, Apartado Postal 877, Ensenada 22830, BC, Mexico 3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650216, Yunnan, Peoples R China 4.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China
推荐引用方式 GB/T 7714	Gao, Dong-Yang,Chen, Xu,Gao, Xing,et al. Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,485(4):4588-4600.
APA	Gao, Dong-Yang.,Chen, Xu.,Gao, Xing.,Guo, Di-Fu.,Hu, Shao-Ming.,...&Li, Kai.(2019).Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,485(4),4588-4600.
MLA	Gao, Dong-Yang,et al."Contact binaries at the short period cut-off - I. Statistics and the first photometric investigations of 10 totally eclipsing systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 485.4(2019):4588-4600.