FLUORINE ABUNDANCES OF GALACTIC LOW-METALLICITY GIANTS
文献类型：期刊论文
| 作者 | Li, H. N.1; Ludwig, H. -G.2; Caffau, E.2; Christlieb, N.2; Zhao, G.1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-03-01 |
| 卷号 | 765期号:1 |
| 关键词 | Galaxy: halo stars: abundances stars: Population II |
| 英文摘要 | With abundances and 2 sigma upper limits of fluorine (F) in seven metal-poor field giants, nucleosynthesis of stellar F at low metallicity is discussed. The measurements are derived from the HF(1-0) R9 line at 23358 angstrom using near-infrared K-band high-resolution spectra obtained with CRIRES at the Very Large Telescope. The sample reaches lower metallicities than previous studies on F of field giants, ranging from [Fe/H] = -1.56 down to -2.13. Effects of three-dimensional model atmospheres on the derived F and O abundances are quantitatively estimated and shown to be insignificant for the program stars. The observed F yield in the form of [F/O] is compared with two sets of Galactic chemical evolution models, which quantitatively demonstrate the contribution of Type II supernova (SN II) nu-process and asymptotic giant branch/Wolf-Rayet stars. It is found that at this low-metallicity region, models cannot well predict the observed distribution of [F/O], while the observations are better fit by models considering an SN II nu-process with a neutrino energy of E-nu = 3 x 10(53) erg. Our sample contains HD 110281, a retrograde orbiting low-alpha halo star, showing a similar F evolution as globular clusters. This supports the theory that such halo stars are possibly accreted from dwarf galaxy progenitors of globular clusters in the halo. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000314957900051 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5949]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany |
| 推荐引用方式 GB/T 7714 | Li, H. N.,Ludwig, H. -G.,Caffau, E.,et al. FLUORINE ABUNDANCES OF GALACTIC LOW-METALLICITY GIANTS[J]. ASTROPHYSICAL JOURNAL,2013,765(1). |
| APA | Li, H. N.,Ludwig, H. -G.,Caffau, E.,Christlieb, N.,&Zhao, G..(2013).FLUORINE ABUNDANCES OF GALACTIC LOW-METALLICITY GIANTS.ASTROPHYSICAL JOURNAL,765(1). |
| MLA | Li, H. N.,et al."FLUORINE ABUNDANCES OF GALACTIC LOW-METALLICITY GIANTS".ASTROPHYSICAL JOURNAL 765.1(2013). |
入库方式： OAI收割
来源：国家天文台
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