Metal-poor Stars Observed with the Automated Planet Finder Telescope. I. Discovery of Five Carbon-enhanced Metal-poor Stars from LAMOST | |
Mardini,Mohammad K.2,3; Li,Haining2; Placco,Vinicius M.4,5; Alexeeva,Sofya6; Carollo,Daniela1; Taani,Ali7; Ablimit,Iminhaji8; Wang,Liang9; Zhao,Gang2,3 | |
刊名 | The Astrophysical Journal |
2019-04-19 | |
卷号 | 875期号:2 |
关键词 | Galaxy: halo stars: abundances stars: fundamental parameters |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ab0fa2 |
英文摘要 | Abstract We report on the discovery of five carbon-enhanced metal-poor (CEMP) stars in the metallicity range of ?3.3?[Fe/H]??2.4. These stars were selected from the LAMOST DR3 low-resolution (R?~?2000) spectroscopic database as metal-poor candidates and followed up with high-resolution spectroscopy (R?~?110,000) with the Lick/APF. Stellar parameters and individual abundances for 25 chemical elements (from Li to Eu) are presented for the first time. These stars exhibit chemical abundance patterns that are similar to those reported in other literature studies of very and extremely metal-poor stars. One of our targets, J2114?0616, shows high enhancement in carbon ([C/Fe]?=?1.37), nitrogen ([N/Fe]?=?1.88), barium ([Ba/Fe]?=?1.00), and europium ([Eu/Fe]?=?0.84). Such chemical abundance pattern suggests that J2114?0616 can be classified as CEMP-r/s star. In addition, the star J1054+0528 can be classified as a CEMP-rI star, with [Eu/Fe]?=?0.44 and [Ba/Fe]?=??0.52. The other stars in our sample show no enhancements in neutron-capture elements and can be classified as CEMP-no stars. We also performed a kinematic and dynamical analysis of the sample stars based on Gaia DR2 data. The kinematic parameters, orbits, and binding energy of these stars show that J2114?0616 is member of the outer-halo population, while the remaining stars belong to the inner-halo population but with an accreted origin. Collectively, these results add important constraints on the origin and evolution of CEMP stars as well as on their possible formation scenarios. |
语种 | 英语 |
出版者 | The American Astronomical Society |
WOS记录号 | IOP:0004-637X-875-2-AB0FA2 |
内容类型 | 期刊论文 |
源URL | [http://ir.bao.ac.cn/handle/114a11/26156] |
专题 | 中国科学院国家天文台 |
作者单位 | 1.INAF Astrophysical Observatory of Turin, Pino Torinese, Italy 2.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang, Beijing 100102, People’s Republic of China; lhn@nao.cas.cn, gzhao@nao.cas.cn 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, People’s Republic of China 4.Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA 5.JINA Center for the Evolution of the Elements, USA 6.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People’s Republic of China 7.Physics Department, Faculty of Science, Al-Balqa Applied University, Al-Salt, Jordan 8.Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan 9.Max-Planck-Institut fur extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany |
推荐引用方式 GB/T 7714 | Mardini,Mohammad K.,Li,Haining,Placco,Vinicius M.,et al. Metal-poor Stars Observed with the Automated Planet Finder Telescope. I. Discovery of Five Carbon-enhanced Metal-poor Stars from LAMOST[J]. The Astrophysical Journal,2019,875(2). |
APA | Mardini,Mohammad K..,Li,Haining.,Placco,Vinicius M..,Alexeeva,Sofya.,Carollo,Daniela.,...&Zhao,Gang.(2019).Metal-poor Stars Observed with the Automated Planet Finder Telescope. I. Discovery of Five Carbon-enhanced Metal-poor Stars from LAMOST.The Astrophysical Journal,875(2). |
MLA | Mardini,Mohammad K.,et al."Metal-poor Stars Observed with the Automated Planet Finder Telescope. I. Discovery of Five Carbon-enhanced Metal-poor Stars from LAMOST".The Astrophysical Journal 875.2(2019). |
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