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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
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume847Issue:1
AbstractWe 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.
SubtypeArticle
KeywordGalaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational 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
WOS KeywordGALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
Indexed BySCI
Language英语
Funding OrganizationNational 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 Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000411410700001
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20112
Collection光学天文研究部
Affiliation1.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
Recommended Citation
GB/T 7714
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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