Three new late-type hypervelocity star candidates from Gaia DR2 with refined selection criteria

作     者：Jiao Li Shi Jia Yan Gao Deng-Kai Jiang Thomas Kupfer Ulrich Heber Chao Liu Xue-Fei Chen Zhan-Wen Han Jiao Li;Shi Jia;Yan Gao;Deng-Kai Jiang;Thomas Kupfer;Ulrich Heber;Chao Liu;Xue-Fei Chen;Zhan-Wen Han

作者机构：Yunnan observatoriesChinese Academy of SciencesKunming 650011China Key Laboratory for the Structure and Evolution of Celestial ObjectsYunnan observatoriesChinese Academy of SciencesKunming 650011China University of Chinese Academy of SciencesBeijing 100049China Center for Astronomical Mega-ScienceChinese Academy of SciencesBeijing 100101China State Key Laboratory of Lunar and Planetary SciencesMacao University of Science and TechnologyMacaoChina Kavli Institute for Theoretical PhysicsUniversity of CaliforniaSanta BarbaraCA 93106USA Department of PhysicsUniversity of CaliforniaSanta BarbaraCA 93106USA Dr.Remeis-Sternwarte&ECAPUniversity of Erlangen-NurnbergErlangenGermany Key Lab of Optical AstronomyNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2020年第20卷第3期

页      面：170-184页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Funding for the DPAC has been provided by national institutions,in particular the institutions participating in the Gaia Multilateral Agreement supported by the Natural Natural Science Foundation of China(NSFC)(Grant Nos.11521303,11573061,11733008 and11661161016) Yunnan province(2015FB190) the Science and Technology Development Fund,Macao SAR(File Nos.001/2016/AFJ and 0001/2019/A1) supported by the NSFC(Grant Nos.11333003and 11390372) 

主　　题：stars kinematics and dynamics-evolution-statistics 

摘      要：Several dozen hypervelocity star(HVS)candidates have been reported based on the second data release of Gaia(Gaia DR2).However,it has been proven that the radial velocities of some Gaia HVS candidates are not *** this paper,we employ refined astrometric criteria to re-examine Gaia DR2,arriving at a more reliable sample of HVS and high velocity star candidates than those found by previous *** develop a method called Binary Escape Probability Analysis to identify some HVS *** method allows us to work with stars having only two epochs of measured radial *** stars were usually discarded in previous similar studies.A scrutiny of our final results sheds light on selection effects present in our studies,which we propose to be the focus of future *** total,we find three late-type(2 G-type and 1 K-type)HVS and 21 high velocity star candidates,3 and 11 of which are new,*** by their historical trajectories,which we calculate,all three HVS candidates could not have had Galactic center *** monitoring is required to confirm their status.