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题名:
Physical properties and catalog of EW-type eclipsing binaries observed by LAMOST
作者: 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
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2017-08
卷号: 17, 期号:8
DOI: 10.1088/1674-4527/17/8/87
学科分类: 天文学
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Qian, SB
关键词: stars: binaries: close ; stars: binaries: spectroscopic ; stars: binaries: eclipsing ; stars: evolution ; SKY AUTOMATED SURVEY ; DATA RELEASE ; OVERCONTACT BINARIES ; TELESCOPE LAMOST ; CONTACT BINARIES ; VARIABLE-STARS ; CLUSTERS ; DISK
英文摘要: 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
原文出处: 查看原文
ISSN号: 1674-4527
文章类型: Article
归档日期: 2017-07-18
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics ; Astronomy & Astrophysics
关键词[WOS]: SKY AUTOMATED SURVEY ; DATA RELEASE ; OVERCONTACT BINARIES ; TELESCOPE LAMOST ; CONTACT BINARIES ; VARIABLE-STARS ; CLUSTERS ; DISK
WOS记录号: WOS:000416068900011
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/11901
Appears in Collections:双星与变星研究组_期刊论文
中国科学院天体结构与演化重点实验室_期刊论文

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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

Recommended Citation:
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).
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