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A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction
Li, Yin-Bi1; Luo, A-Li1; Zhao, Gang1; Lu, You-Jun1; Zhang, Xue-Sen2; Zhang, Fu-Peng3; Du, Bing1; Zuo, Fang1; Zhang, Lan1; Huang, Yang4,6; Xiang, Mao-Sheng1,6; Zhao, Jing-Kun1; Zhao, Yong-Heng1; Han ZW(韩占文)5
发表期刊ASTRONOMICAL JOURNAL
2018-09-01
卷号156期号:3
DOI10.3847/1538-3881/aad09a
产权排序第5完成单位
收录类别SCI
关键词Galaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
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.

项目资助者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
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
ISSN0004-6256
URL查看原文
WOS记录号WOS:000441303000004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]Horizontal-branch Stars ; Sky Survey 2mass ; 1st Data Release ; Hypervelocity Stars ; Black-hole ; Local Standard ; O-star ; Mass ; Origin ; Halo
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17383
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Luo, A-Li; Zhao, Gang; Lu, You-Jun
作者单位1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
2.ExtantFuture (Beijing)Technology Co., Ltd, Beijing 100102, People's Republic of China
3.School of physics and astronomy, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
4.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People's Republic of China
5.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories,Chinese Academy of Sciences, Kunming 650216, People's Republic of China
6.LAMOST Fellow.
推荐引用方式
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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).
APA Li, Yin-Bi.,Luo, A-Li.,Zhao, Gang.,Lu, You-Jun.,Zhang, Xue-Sen.,...&Han ZW.(2018).A New Hyper-runaway Star Discovered from LAMOST and Gaia: Ejected Almost in the Galactic Rotation Direction.ASTRONOMICAL JOURNAL,156(3).
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).
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