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Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys
Huang, Y.1,2,7; Liu, X. -W.1,2,3; Zhang, H. -W.2,3; Chen, B. -Q.1; Xiang, M. -S.4,7; Wang, C.2; Yuan, H. -B.5; Tian, Z. -J.2,7; Li, Y. -B.4; Wang B(王博)6; Huang, Y.(Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China)
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2017-09-20
卷号847期号:1
DOI10.3847/2041-8213/aa894b
产权排序第6完成单位
收录类别SCI
关键词Galaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
摘要We report the discovery of two new unbound hypervelocity stars (HVSs) from the LAMOST spectroscopic surveys. They are, respectively, a B2V-type star of similar to 7M(circle dot) with a Galactic rest-frame radial velocity of 502 km s(-1) at a Galactocentric radius of similar to 21 kpc and a B7V-type star of similar to 4M(circle dot) with a Galactic rest-frame radial velocity of 408 km s-1 at a Galactocentric radius of similar to 30 kpc. The origins of the two HVSs are not clear given their currently poorly measured proper motions. However, the future data releases of Gaia should provide proper motion measurements accurate enough to solve this problem. The ongoing LAMOST spectroscopic surveys are expected to yield more HVSs to form a statistical sample, providing vital constraints on understanding the nature of HVSs and their ejection mechanisms.
项目资助者National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M600849) ; National Natural Science Foundation of China(11473001, 11233004) ; Special fund for Advanced Users ; National Development and Reform Commission
语种英语
学科领域天文学
文章类型Article
ISSN2041-8205
URL查看原文
WOS记录号WOS:000411410700001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11943
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Huang, Y.(Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China)
作者单位1.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, China
2.Department of Astronomy, Peking University, Beijing 100871, China
3.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
4.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
5.Department of Astronomy, Beijing Normal University, Beijing 100875, China
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, CAS, Kunming 650216, China
7.LAMOST Fellow.
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Huang, Y.,Liu, X. -W.,Zhang, H. -W.,et al. Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,847(1).
APA Huang, Y..,Liu, X. -W..,Zhang, H. -W..,Chen, B. -Q..,Xiang, M. -S..,...&Huang, Y..(2017).Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys.ASTROPHYSICAL JOURNAL LETTERS,847(1).
MLA Huang, Y.,et al."Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys".ASTROPHYSICAL JOURNAL LETTERS 847.1(2017).
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