A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction

doi:10.3847/1538-3881/aad09a

CORC > 国家天文台 > 中国科学院国家天文台

	A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction
	Li, Yin-Bi 1; Luo, A-Li 1; Zhao, Gang 1; Lu, You-Jun 1; Zhang, Xue-Sen 2; Zhang, Fu-Peng 3; Du, Bing 1; Zuo, Fang 1; Zhang, Lan 1; Huang, Yang 4
刊名	ASTRONOMICAL JOURNAL
	2018-09-01
卷号	156 期号:3 页码:7
关键词	Galaxy: center Galaxy: halo Galaxy: kinematics and dynamics stars: early-type
ISSN号	0004-6256
DOI	10.3847/1538-3881/aad09a
英文摘要	In this paper, we report the discovery of a new late-B-type unbound hyper-runaway star (LAMOST-HVS4) from the LAMOST spectroscopic surveys. According to its atmospheric parameters, it is either a B-type main-sequence (MS) star or a blue horizontal branch (BHB) star. Its Galactocentric distance and velocity are 30.3 +/- 1.6 kpc and 586 +/- 7 km s(-1) if it is an MS star, and they are 13.2 +/- 3.7 kpc and 590 +/- 7 km s(-1) if a BHB star. We track its trajectories back and find that the trajectories intersect with the Galactic disk, and the Galactic center lies outside of the intersection region at the 3a confidence level. We investigate a number of mechanisms that could be responsible for the ejection of the star and find that it is probably ejected from the Galactic disk by supernova explosion or multiple-body interactions in dense young stellar clusters.
资助项目	National Basic Research Program of China (973 Program)[2014CB845700] ; National Natural Science Foundation of China[11390371/2/4] ; National Science Foundation of China (NSFC)[11773033] ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; National Development and Reform Commission
WOS关键词	HORIZONTAL-BRANCH STARS ; SKY SURVEY 2MASS ; 1ST DATA RELEASE ; HYPERVELOCITY STARS ; BLACK-HOLE ; LOCAL STANDARD ; O-STAR ; MASS ; ORIGIN ; HALO
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000441303000004
资助机构	National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Foundation of China (NSFC) ; National Science Foundation of China (NSFC) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; National Development and Reform Commission ; National Development and Reform Commission
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22262]
专题	中国科学院国家天文台
通讯作者	Li, Yin-Bi
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China 2.ExtantFuture Beijing Technol Co Ltd, Beijing 100102, Peoples R China 3.Sun Yat Sen Univ, Sch Phys & Astron, Guangzhou 510275, Guangdong, Peoples R China 4.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China 5.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Li, Yin-Bi,Luo, A-Li,Zhao, Gang,et al. A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction[J]. ASTRONOMICAL JOURNAL,2018,156(3):7.
APA	Li, Yin-Bi.,Luo, A-Li.,Zhao, Gang.,Lu, You-Jun.,Zhang, Xue-Sen.,...&Han, Zhan-Wen.(2018).A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction.ASTRONOMICAL JOURNAL,156(3),7.
MLA	Li, Yin-Bi,et al."A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction".ASTRONOMICAL JOURNAL 156.3(2018):7.