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Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST
Qian SB(钱声帮)1,2,3,4; Zhang J(张嘉)1,2,3; He JJ(何家佳)1,2,3; Zhu LY(朱俐颖)1,2,3,4; Zhao EG(赵二刚)1,2,3,4; Shi XD(施相东)1,2,3; Zhou X(周肖)1,2,3; Han ZT(韩忠涛)1,2,3,4
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2018-03-01
Volume235Issue:1
DOI10.3847/1538-4365/aaa601
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Binaries: Spectroscopic Stars: Evolution Stars: Fundamental Parameters
Abstract

About 3196 EA-type binaries (EAs) were observed by LAMOST by 2017 June 16 and their spectral types were derived. Meanwhile, the stellar atmospheric parameters of 2020 EAs were determined. In this paper, those EAs are cataloged and their physical properties and evolutionary states are investigated. The period distribution of EAs suggests that the period limit of tidal locking for the close binaries is about 6 days. It is found that the metallicity of EAs is higher than that of EW-type binaries (EWs), indicating that EAs are generally younger than EWs and they are the progenitors of EWs. The metallicities of long-period EWs (0.4 < P < 1 days) are the same as those of EAs with the same periods, while their values of Log (g) are usually smaller than those of EAs. These support the evolutionary process that EAs evolve into long-period EWs through the combination of angular momentum loss (AML) via magnetic braking and case A mass transfer. For short-period EWs, their metallicities are lower than those of EAs, while their gravitational accelerations are higher. These reveal that they may be formed from cool short-period EAs through AML via magnetic braking with little mass transfer. For some EWs with high metallicities, they may be contaminated by material from the evolution of unseen neutron stars and black holes or they have third bodies that may help them to form rapidly through a short timescale of pre-contact evolution. The present investigation suggests that the modern EW populations may have formed through a combination of these mechanisms.

Funding ProjectChinese Natural Science Foundation[11325315] ; National Development and Reform Commission
Funding OrganizationChinese Natural Science Foundation[11325315] ; National Development and Reform Commission
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0067-0049
URL查看原文
WOS IDWOS:000425964300002
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSKY AUTOMATED SURVEY ; RADIAL-VELOCITY ; CONTACT BINARY ; ANGULAR-MOMENTUM ; DATA RELEASE ; OVERCONTACT BINARIES ; SPECTROSCOPIC SURVEY ; TELESCOPE LAMOST ; PLANET-DETECTION ; VARIABLE-STARS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12128
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 (CAS), P.O. Box 110, 650011 Kunming, People's Republic of China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Zhang J,He JJ,et al. Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,235(1).
APA Qian SB.,Zhang J.,He JJ.,Zhu LY.,Zhao EG.,...&Han ZT.(2018).Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,235(1).
MLA Qian SB,et al."Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 235.1(2018).
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