The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R-II Star Known
文献类型：期刊论文
| 作者 | Holmbeck, Erika M.1,2; Beers, Timothy C.1,2; Roederer, Ian U.2,3; Placco, Vinicius M.1,2; Hansen, Terese T.4; Sakari, Charli M.5; Sneden, Christopher6,7; Liu, Chao8; Lee, Young Sun9; Cowan, John J.10 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2018-06-01 |
| 卷号 | 859期号:2页码:6 |
| 关键词 | Galaxy: halo stars: abundances stars: atmospheres stars: individual (2MASS J09544277+5246414) stars: Population II |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aac722 |
| 英文摘要 | We report the discovery of a new actinide-boost star, 2MASS. J09544277+5246414, originally identified as a very bright (V = 10.1), extremely metal-poor ([Fe/H] = -2.99) K giant in the LAMOST survey, and found to be highly r-process-enhanced (r-II; [Eu/Fe] = +1.28]), during the snapshot phase of the R-Process Alliance (RPA). Based on a high signal-to-noise ratio (S/N), high-resolution spectrum obtained with the Harlan J. Smith 2.7 m telescope, this star is the first confirmed actinide-boost star found by RPA efforts. With an enhancement of [Th/Eu] = +0.37, 2MASS. J09544277+ 5246414 is also the most actinide-enhanced r-II star yet discovered, and only the sixth metalpoor star with a measured uranium abundance ([U/Fe] = +1.40). Using the Th/U chronometer, we estimate an age of 13.0 +/- 4.7. Gyr for this star. The unambiguous actinide-boost signature of this extremely metal-poor star, combined with additional r-process-enhanced and actinide-boost stars identified by the RPA, will provide strong constraints on the nature and origin of the r-process at early times. |
| WOS关键词 | NEUTRON-CAPTURE ; CS 31082-001 ; HALO STAR ; ABUNDANCE ; GALAXY ; EVOLUTION ; ELEMENTS ; PATTERN ; SEARCH ; FE/H |
| 资助项目 | Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation[PHY 14-30152] ; NSF[AST1616040] ; National Research Foundation of Korea - Ministry of Science and ICT[2017R1A5A1070354] ; National Research Foundation of Korea - Ministry of Science and ICT[NRF-2015R1C1A1A02036658] ; National Research Foundation of Korea - Ministry of Science and ICT[NRF-2018R1A2B6003961] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000433932700001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; NSF ; NSF ; National Research Foundation of Korea - Ministry of Science and ICT ; National Research Foundation of Korea - Ministry of Science and ICT ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; NSF ; NSF ; National Research Foundation of Korea - Ministry of Science and ICT ; National Research Foundation of Korea - Ministry of Science and ICT ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; NSF ; NSF ; National Research Foundation of Korea - Ministry of Science and ICT ; National Research Foundation of Korea - Ministry of Science and ICT ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation ; NSF ; NSF ; National Research Foundation of Korea - Ministry of Science and ICT ; National Research Foundation of Korea - Ministry of Science and ICT |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/21708]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Holmbeck, Erika M. |
| 作者单位 | 1.Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA 2.JINA Ctr Evolut Elements, E Lansing, MI 48824 USA 3.Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA 4.Observ Carnegie Inst Washington, Pasadena, CA 91101 USA 5.Univ Washington, Dept Astron, Seattle, WA 98195 USA 6.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 7.Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA 8.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 9.Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134, South Korea 10.Univ Oklahoma, HLD Dept Phys & Astron, Norman, OK 73019 USA |
| 推荐引用方式 GB/T 7714 | Holmbeck, Erika M.,Beers, Timothy C.,Roederer, Ian U.,et al. The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R-II Star Known[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,859(2):6. |
| APA | Holmbeck, Erika M..,Beers, Timothy C..,Roederer, Ian U..,Placco, Vinicius M..,Hansen, Terese T..,...&Frebel, Anna.(2018).The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R-II Star Known.ASTROPHYSICAL JOURNAL LETTERS,859(2),6. |
| MLA | Holmbeck, Erika M.,et al."The R-Process Alliance: 2MASS J09544277+5246414, the Most Actinide-enhanced R-II Star Known".ASTROPHYSICAL JOURNAL LETTERS 859.2(2018):6. |
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来源：国家天文台
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