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Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys
Huang, Y.1,2; Liu, X. -W.1,2,3; Zhang, H. -W.2,3; Chen, B. -Q.1; Xiang, M. -S.4; Wang, C.2; Yuan, H. -B.5; Tian, Z. -J.2; Li, Y. -B.4; Wang, B.6
2017-09-20
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号847期号:1
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.
文章类型Article
关键词Galaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
WOS标题词Science & Technology ; Physical Sciences
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M600849) ; China Postdoctoral Science Foundation(2016M600849) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; Special fund for Advanced Users ; Special fund for Advanced Users ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M600849) ; China Postdoctoral Science Foundation(2016M600849) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; Special fund for Advanced Users ; Special fund for Advanced Users ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
DOI10.3847/2041-8213/aa894b
关键词[WOS]GALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
收录类别SCI
语种英语
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M600849) ; China Postdoctoral Science Foundation(2016M600849) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; Special fund for Advanced Users ; Special fund for Advanced Users ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M600849) ; China Postdoctoral Science Foundation(2016M600849) ; National Natural Science Foundation of China(11473001 ; National Natural Science Foundation of China(11473001 ; Special fund for Advanced Users ; Special fund for Advanced Users ; National Development and Reform Commission ; National Development and Reform Commission ; 11233004) ; 11233004)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000411410700001
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20112
专题光学天文研究部
作者单位1.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
5.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
6.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China
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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..,...&Wang, B..(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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