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
	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
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
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa894b
产权排序	第6完成单位
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.
学科主题	天文学 ; 恒星与银河系 ; 恒星天文学
URL标识	查看原文
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
资助项目	National Key Basic Research Program of China[2014CB845700] ; China Postdoctoral Science Foundation[2016M600849] ; National Natural Science Foundation of China[11233004] ; National Natural Science Foundation of China[11233004] ; Special fund for Advanced Users ; National Development and Reform Commission
WOS关键词	GALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000411410700001
资助机构	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
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/11943]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
通讯作者	Huang, Y.
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.
推荐引用方式 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).