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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
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2017-09-20
Volume847Issue:1
DOI10.3847/2041-8213/aa894b
Contribution Rank第6完成单位
Indexed BySCI
KeywordGalaxy: Center Galaxy: Halo Galaxy: Kinematics And Dynamics Stars: Early-type
Abstract

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.

Funding ProjectNational 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
Funding OrganizationNational 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
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN2041-8205
URL查看原文
WOS IDWOS:000411410700001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGALACTIC HALO ; BLACK-HOLE ; ORIGIN ; MASS ; EJECTION ; MILKY
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11943
Collection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
Corresponding AuthorHuang, Y.
Affiliation1.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.
Recommended Citation
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).
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