Footprints of the weak s-process in the carbon-enhanced metal-poor star ET0097
文献类型：期刊论文
| 作者 | Yang, Guochao1; Li, Hongjie1,2; Liu, Nian3; Cui, Wenyuan1; Liang, Yanchun4 ; Zhang, Bo1
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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
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| 出版日期 | 2016-09-01 |
| 卷号 | 361期号:9 |
| 关键词 | Stars: abundances Stars: chemically peculiar Stars: individual (ET0097) |
| 英文摘要 | Historically, the weak s-process contribution to metal-poor stars is thought to be extremely small, due to the effect of the secondary-like nature of the neutron source Ne-22(alpha, n)Mg-25 in massive stars, which means that metal-poor "weak s-process stars" could not be found. ET0097 is the first observed carbon-enhanced metal-poor (CEMP) star in the Sculptor dwarf spheroidal galaxy. Because C is enriched and the elements heavier than Ba are not overabundant, ET0097 can be classified as a CEMP-no star. However, this star shows overabundances of lighter n-capture elements (i.e., Sr, Y and Zr). In this work, having adopted the abundance decomposition approach, we investigate the astrophysical origins of the elements in ET0097. We find that the light elements and iron-peak elements (from O to Zn) of the star mainly originate from the primary process of massive stars and the heavier n-capture elements (heavier than Ba) mainly come from the main r-process. However, the lighter n-capture elements such as Sr, Y and Zr should mainly come from the primary weak s-process. The contributed fractions of the primary weak s-process to the Sr, Y and Zr abundances of ET0097 are about 82 %, 84 % and 58 % respectively, suggesting that the CEMP star ET0097 should have the footprints of the weak s-process. The derived result should be a significant evidence that the weak s-process elements can be produced in metal-poor massive stars. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ASYMPTOTIC GIANT BRANCH ; NEUTRON-CAPTURE NUCLEOSYNTHESIS ; GALACTIC CHEMICAL EVOLUTION ; R-PROCESS ELEMENTS ; MASSIVE STARS ; BINARY FREQUENCY ; HEAVY-ELEMENTS ; EARLY GALAXY ; ABUNDANCES ; MERGERS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000382146100040 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5266]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Hebei Normal Univ, Dept Phys, 20 Rd East 2nd Ring South, Shijiazhuang 050024, Peoples R China 2.Hebei Univ Sci & Technol, Sch Sci, Shijiazhuang 050018, Peoples R China 3.Beijing Normal Univ, Dept Astron, 19 XinJieKouWai St, Beijing 100875, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Guochao,Li, Hongjie,Liu, Nian,et al. Footprints of the weak s-process in the carbon-enhanced metal-poor star ET0097[J]. ASTROPHYSICS AND SPACE SCIENCE,2016,361(9). |
| APA | Yang, Guochao,Li, Hongjie,Liu, Nian,Cui, Wenyuan,Liang, Yanchun,&Zhang, Bo.(2016).Footprints of the weak s-process in the carbon-enhanced metal-poor star ET0097.ASTROPHYSICS AND SPACE SCIENCE,361(9). |
| MLA | Yang, Guochao,et al."Footprints of the weak s-process in the carbon-enhanced metal-poor star ET0097".ASTROPHYSICS AND SPACE SCIENCE 361.9(2016). |
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来源：国家天文台
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