Two New r-process-enhanced Stars with [Fe/H] >-0.6 dex from the LAMOST-MRS Survey

作     者：Xiao-Jin Xie Jian-Rong Shi Tian-Lu Chen Hong-Liang Yan Tian-Yi Chen Kai-Ke Pan Chun-Qian Li Shuai Liu Qi Gao Tai-Sheng Yan Ming-Yi Ding Xiao-Jin Xie;Jian-Rong Shi;Tian-Lu Chen;Hong-Liang Yan;Tian-Yi Chen;Kai-Ke Pan;Chun-Qian Li;Shuai Liu;Qi Gao;Tai-Sheng Yan;Ming-Yi Ding

作者机构：Department of PhysicsCollege of ScienceTibet UniversityLhasa 850000China Key Laboratory of Optical AstronomyNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Key Laboratory of Cosmic Rays(Tibet University)Ministry of EducationLhasa 850000China School of Astronomy and Space ScienceUniversity of Chinese Academy of SciencesBeijing 100049China Apache Point ObservatorySunspotNew Mexico 88349USA Astronomy DepartmentNew Mexico State UniversityLas CrucesNew Mexico 88003USA 

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

年 卷 期：2022年第22卷第7期

页      面：109-117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：supported by the National Key R&D Program of China No. 2019YFA0405502 the National Natural Science Foundation of China under grant Nos. 12090040, 12090044, 11833006, 12022304, 11973052, 11973042 and U2031144 the science research grants from the China Manned Space Project with NO.CMS-CSST-2021B05 the supports from Youth Innovation Promotion Association (id. 2019060), Chinese Academy of Sciences Physics Frontier Center/JINA Center for the Evolution of the Element (JINA-CEE), awarded by the US National Science Foundation partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences Guo Shou Jing Telescope (the Large Sky Area MultiObject Fiber Spectroscopic Telescope, LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission 

主　　题：stars:abundances stars:chemically peculiar stars:fundamental parameters 

摘      要：We report the discovery of two r-process-enhanced stars with [Fe/H]-0.6 dex selected from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST) *** candidate stars have been selected from the LAMOST medium-resolution(R~ 7500) spectroscopic survey,and the follo wed-up high signal-to-noise ratio and high-resolution(R~31,500) spectra are obtained with the ARC Echelle Spectrograph mounted on the3.5 m telescope at the Apache Point Observatory,which allow us for the determination of stellar atmospheric parameters and abundances of 20 *** these three r-process-enhanced candidate stars,TYC 1710-933-1 and TYC 2858-372-1 have [Eu/Fe] higher than 0.3 dex and [Ba/Eu] lower than 0.0 dex,thus,can be identified as new r-process-enhanced *** 2858-372-1 shows similar r+s-process pattern to the *** 1710-933-1 presents enhancement of the r-process elements of Nd and *** work indicates that the enrichment mechanisms of the heavy neutron-capture elements are complicated for metal-rich stars.