Metal-poor Stars Observed with the Automated Planet Finder Telescope. II. Chemodynamical Analysis of Six Low-metallicity Stars in the Halo System of the Milky Way
文献类型:期刊论文
作者 | Mardini,Mohammad K.1,2; Placco,Vinicius M.3,4; Taani,Ali5; Li,Haining1![]() ![]() |
刊名 | The Astrophysical Journal
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出版日期 | 2019-08-28 |
卷号 | 882期号:1 |
关键词 | Galaxy: halo stars: abundances stars: atmospheres stars: fundamental parameters stars: kinematics and dynamics techniques: imaging spectroscopy |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ab3047 |
英文摘要 | Abstract In this work, we study the chemical compositions and kinematic properties of six metal-poor stars with [Fe/H]??2.5 in the Galactic halo. From high-resolution (R?~?110,000) spectroscopic observations obtained with the Lick/Automated Planet Finder, we determined individual abundances for up to 23 elements, to quantitatively evaluate our sample. We identify two carbon-enhanced metal-poor stars (J1630+0953 and J2216+0246) without enhancement in neutron-capture elements (CEMP-no stars), while the rest of our sample stars are carbon-intermediate. By comparing the light-element abundances of the CEMP stars with predicted yields from nonrotating zero-metallicity massive-star models, we find that the possible progenitors of J1630+0953 and J2216+0246 could be in the 13–25 M⊙ mass range, with explosion energies (0.3–1.8)?×?1051 erg. In addition, the detectable abundance ratios of light and heavy elements suggest that our sample stars are likely formed from a well-mixed gas cloud, which is consistent with previous studies. We also present a kinematic analysis, which suggests that most of our program stars likely belong to the inner-halo population, with orbits passing as close as ~2.9 kpc from the Galactic center. We discuss the implications of these results on the critical constraints on the origin and evolution of CEMP stars, as well as the nature of the Population III progenitors of the lowest-metallicity stars in our Galaxy. |
语种 | 英语 |
WOS记录号 | IOP:0004-637X-882-1-AB3047 |
出版者 | The American Astronomical Society |
源URL | [http://ir.bao.ac.cn/handle/114a11/27689] ![]() |
专题 | 中国科学院国家天文台 |
作者单位 | 1.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China; lhn@nao.cas.cn, gzhao@nao.cas.cn 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People’s Republic of China 3.Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA 4.JINA Center for the Evolution of the Elements, USA 5.Physics Department, Faculty of Science, Al-Balqa Applied University, Al-Salt, Jordan |
推荐引用方式 GB/T 7714 | Mardini,Mohammad K.,Placco,Vinicius M.,Taani,Ali,et al. Metal-poor Stars Observed with the Automated Planet Finder Telescope. II. Chemodynamical Analysis of Six Low-metallicity Stars in the Halo System of the Milky Way[J]. The Astrophysical Journal,2019,882(1). |
APA | Mardini,Mohammad K.,Placco,Vinicius M.,Taani,Ali,Li,Haining,&Zhao,Gang.(2019).Metal-poor Stars Observed with the Automated Planet Finder Telescope. II. Chemodynamical Analysis of Six Low-metallicity Stars in the Halo System of the Milky Way.The Astrophysical Journal,882(1). |
MLA | Mardini,Mohammad K.,et al."Metal-poor Stars Observed with the Automated Planet Finder Telescope. II. Chemodynamical Analysis of Six Low-metallicity Stars in the Halo System of the Milky Way".The Astrophysical Journal 882.1(2019). |
入库方式: OAI收割
来源:国家天文台
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