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Physical properties and catalog of EW-type eclipsing binaries observed by LAMOST
Qian SB(钱声帮)1,2,3,4; He JJ(何家佳)1,2,3; Zhang J(张嘉)1,2,3; Zhu LY(朱俐颖)1,2,3,4; Shi XD(施相东)1,2,3; Zhao EG(赵二刚)1,2,3,4; Zhou X(周肖)1,2,3
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2017-08-01
Volume17Issue:8
DOI10.1088/1674-4527/17/8/87
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Binaries: Close Stars: Binaries: Spectroscopic Stars: Binaries: Eclipsing Stars: Evolution
Abstract

EW-type eclipsing binaries (hereafter called EWs) are strong interacting systems in which both component stars usually fill their critical Roche lobes and share a common envelope. Numerous EWs were discovered by several deep photometric surveys and there were about 40 785 EW-type binary systems listed in the international variable star index (VSX) by 2017 March 13. 7938 of them were observed with LAMOST by 2016 November 30 and their spectral types were identified. Stellar atmospheric parameters of 5363 EW-type binary stars were determined based on good spectroscopic observations. In the paper, those EWs are cataloged and their properties are analyzed. The distributions of orbital period (P), effective temperature (T), gravitational acceleration (log(g)), metallicity ([Fe/H]) and radial velocity (RV) are presented for these observed EW-type systems. It is shown that about 80.6% of sample stars have metallicity below zero, indicating that EW-type systems are old stellar populations. This is in agreement with the conclusion that EW binaries are formed from moderately close binaries through angular momentum loss via magnetic braking that takes a few hundred million to a few billion years. The unusually high metallicities of a few percent of EWs may be caused by contamination of material from the evolution of unseen neutron stars or black holes in the systems. The correlations between orbital period and effective temperature, gravitational acceleration and metallicity are presented and their scatters are mainly caused by (i) the presence of third bodies and (ii) sometimes wrongly determined periods. It is shown that some EWs contain evolved component stars and the physical properties of EWs mainly depend on their orbital periods. It is found that extremely short-period EWs may be older than their long-period cousins because they have lower metallicities. This reveals that they have a longer timescale of pre-contact evolution and their formation and evolution are mainly driven by angular momentum loss via magnetic braking.

Funding ProjectNational Natural Science Foundation of China[11325315] ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China[11325315] ; National Development and Reform Commission
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
Archive Date2017-07-18
WOS IDWOS:000416068900011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSKY AUTOMATED SURVEY ; DATA RELEASE ; OVERCONTACT BINARIES ; TELESCOPE LAMOST ; CONTACT BINARIES ; VARIABLE-STARS ; CLUSTERS ; DISK
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11901
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorQian SB(钱声帮)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, China
4.University of the Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,He JJ,Zhang J,et al. Physical properties and catalog of EW-type eclipsing binaries observed by LAMOST[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(8).
APA Qian SB.,He JJ.,Zhang J.,Zhu LY.,Shi XD.,...&Zhou X.(2017).Physical properties and catalog of EW-type eclipsing binaries observed by LAMOST.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(8).
MLA Qian SB,et al."Physical properties and catalog of EW-type eclipsing binaries observed by LAMOST".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.8(2017).
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