Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys

doi:10.3847/2041-8213/aa894b

	Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys
	Wang, B.4 ; Li, Y. -B.2; Tian, Z. -J.1; Yuan, H. -B.3; Wang, C.1 ; Xiang, M. -S.2; Chen, B. -Q.5; Zhang, H. -W.1,6; Liu, X. -W.1,5,6; Huang, Y.1,5
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2017-09-20
卷号	847 期号:1
关键词	Galaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
DOI	10.3847/2041-8213/aa894b
文献子类	Article
英文摘要	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.
WOS关键词	GALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000411410700001
资助机构	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)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/20112]
专题	国家天文台_光学天文研究部
作者单位	1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 4.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China 5.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China 6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, B.,Li, Y. -B.,Tian, Z. -J.,et al. Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,847(1).
APA	Wang, B..,Li, Y. -B..,Tian, Z. -J..,Yuan, H. -B..,Wang, C..,...&Huang, Y..(2017).Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys.ASTROPHYSICAL JOURNAL LETTERS,847(1).
MLA	Wang, B.,et al."Discovery of Two New Hypervelocity Stars from the LAMOST Spectroscopic Surveys".ASTROPHYSICAL JOURNAL LETTERS 847.1(2017).