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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
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2017-08-01
卷号17期号:8
DOI10.1088/1674-4527/17/8/87
产权排序第1完成单位
收录类别SCI
关键词Stars: Binaries: Close Stars: Binaries: Spectroscopic Stars: Binaries: Eclipsing Stars: Evolution
摘要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.
项目资助者National Natural Science Foundation of China(11325315) ; National Development and Reform Commission
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2017-07-18
WOS记录号WOS:000416068900011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SKY AUTOMATED SURVEY ; DATA RELEASE ; OVERCONTACT BINARIES ; TELESCOPE LAMOST ; CONTACT BINARIES ; VARIABLE-STARS ; CLUSTERS ; DISK
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11901
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Qian SB(钱声帮)
作者单位1.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
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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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