| 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
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| 发表期刊 | ASTRONOMICAL JOURNAL
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| 2018-09-01 | |
| 卷号 | 156期号:3 |
| DOI | 10.3847/1538-3881/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. |
| 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 |
| 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 |
| 文章类型 | Article |
| 出版者 | IOP PUBLISHING LTD |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| ISSN | 0004-6256 |
| 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 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). |
| 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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| A New Hyper-runaway （1398KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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