Chemical abundance analysis of 19 barium stars
文献类型：期刊论文
| 作者 | Yang, Guo-Chao1,2,3; Liang, Yan-Chun2 ; Spite, Monique4; Chen, Yu-Qin2; Zhao, Gang2; Zhang, Bo1,2; Liu, Guo-Qing2,5,6; Liu, Yu-Juan2; Liu, Nian7; Deng, Li-Cai2
|
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2016 |
| 卷号 | 16期号:1 |
| 关键词 | methods: observational stars: abundances stars: atmospheres stars: chemically peculiar stars: kinematics and dynamics stars: late-type |
| 英文摘要 | We aim at deriving accurate atmospheric parameters and chemical abundances of 19 barium (Ba) stars, including both strong and mild Ba stars, based on the high signal-to-noise ratio and high resolution Echelle spectra obtained from the 2.16 m telescope at Xinglong station of National Astronomical Observatories, Chinese Academy of Sciences. The chemical abundances of the sample stars were obtained from an LTE, plane-parallel and line-blanketed atmospheric model by inputting the atmospheric parameters (effective temperatures T-eff, surface gravities log g, metallicity [Fe/H] and microturbulence velocity. xi(t)) and equivalent widths of stellar absorption lines. These samples of Ba stars are giants as indicated by atmospheric parameters, metallicities and kinematic analysis about UVW velocity. Chemical abundances of 17 elements were obtained for these Ba stars. Their Na, Al, alpha- and iron-peak elements (O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Ni) are similar to the solar abundances. Our samples of Ba stars show obvious overabundances of neutron-capture (n-capture) process elements relative to the Sun. Their median abundances of [Ba/Fe], [La/Fe] and [Eu/Fe] are 0.54, 0.65 and 0.40, respectively. The Y I and Zr I abundances are lower than Ba, La and Eu, but higher than the alpha-and iron-peak elements for the strong Ba stars and similar to the iron-peak elements for the mild stars. There exists a positive correlation between Ba intensity and [Ba/Fe]. For the n-capture elements (Y, Zr, Ba, La), there is an anti-correlation between their [X/Fe] and [Fe/H]. We identify nine of our sample stars as strong Ba stars with [Ba/Fe]>0.6 where seven of them have Ba intensity Ba=2-5, one has Ba=1.5 and another one has Ba=1.0. The remaining ten stars are classified as mild Ba stars with 0.17<[Ba/Fe]<0.54. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000368088700019 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5466]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Hebei Normal Univ, Coll Phys & Informat Engn, Shijiazhuang 050024, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Observ Paris, GEPI, F-92195 Meudon, France 5.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 6.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 7.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 8.Shijiazhuang Univ, Dept Phys, Shijiazhuang 050035, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Guo-Chao,Liang, Yan-Chun,Spite, Monique,et al. Chemical abundance analysis of 19 barium stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(1). |
| APA | Yang, Guo-Chao.,Liang, Yan-Chun.,Spite, Monique.,Chen, Yu-Qin.,Zhao, Gang.,...&Deng Licai.(2016).Chemical abundance analysis of 19 barium stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(1). |
| MLA | Yang, Guo-Chao,et al."Chemical abundance analysis of 19 barium stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.1(2016). |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。