| r-process Abundance Patterns in the Globular Cluster M92 | |
Kirby, Evan N.1; Ji, Alexander P.2,3; Kovalev, Mikhail4,5
| |
| 发表期刊 | ASTROPHYSICAL JOURNAL
 |
| 2023-11-01 | |
| 卷号 | 958期号:1 |
| DOI | 10.3847/1538-4357/acf309 |
| 产权排序 | 第4完成单位 |
| 收录类别 | SCI |
| 摘要 | Whereas light-element abundance variations are a hallmark of globular clusters, there is little evidence for variations in neutron-capture elements. A significant exception is M15, which shows a star-to-star dispersion in neutron-capture abundances of at least one order of magnitude. The literature contains evidence both for and against a neutron-capture dispersion in M92. We conducted an analysis of archival Keck/HIRES spectra of 35 stars in M92, 29 of which are giants, which we use exclusively for our conclusions. M92 conforms to the abundance variations typical of massive clusters. Like other globular clusters, its neutron-capture abundances were generated by the r-process. We confirm a star-to-star dispersion in r-process abundances. Unlike M15, the dispersion is limited to first-generation (low-Na, high-Mg) stars, and the dispersion is smaller for Sr, Y, and Zr than for Ba and the lanthanides. This is the first detection of a relation between light-element and neutron-capture abundances in a globular cluster. We propose that a source of the main r-process polluted the cluster shortly before or concurrently with the first generation of star formation. The heavier r-process abundances were inhomogeneously distributed while the first-generation stars were forming. The second-generation stars formed after several crossing times (similar to 0.8 Myr); hence, the second generation shows no r-process dispersion. This scenario imposes a minimum temporal separation of 0.8 Myr between the first and second generations. |
| 资助项目 | National Science Foundation (NSF)https://doi.org/10.13039/100000001[star X-20 with HIRES]; California Planet Search consortium; National Aeronautics and Space Administration - National Aeronautics and Space Administration; National Science Foundation (NSF)[AST-2233781]; NSF CAREER grant[AST-2206264]; U.S. National Science Foundation (NSF)[PHY-1607611]; NSF |
| 项目资助者 | National Science Foundation (NSF)https://doi.org/10.13039/100000001[star X-20 with HIRES] ; California Planet Search consortium ; National Aeronautics and Space Administration - National Aeronautics and Space Administration ; National Science Foundation (NSF)[AST-2233781] ; NSF CAREER grant[AST-2206264] ; U.S. National Science Foundation (NSF)[PHY-1607611] ; NSF |
| 语种 | 英语 |
| 学科领域 | 天文学 |
| 文章类型 | Article |
| 出版者 | IOP Publishing Ltd |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| ISSN | 0004-637X |
| URL | 查看原文 |
| WOS记录号 | WOS:001123547100001 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | MULTIPLE STELLAR POPULATIONS ; METAL-POOR STARS ; MERGED DATA SETS ; HEAVY-ELEMENT DISPERSION ; NEUTRON-CAPTURE ELEMENTS ; RED GIANT BRANCH ; NON-LTE ; OXYGEN ABUNDANCES ; HALO GIANTS ; CHEMICAL INVENTORY |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/26446 |
| 专题 | 大样本恒星演化研究组 中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.Department of Physics and Astronomy, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA; [email protected]; 2.Department of Astronomy & Astrophysics, University of Chicago, 5640 S Ellis Avenue, Chicago, IL 60637, USA; 3.Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA; 4.Yunnan Observatories, China Academy of Sciences, Kunming 650216, People's Republic of China; 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Kirby, Evan N.,Ji, Alexander P.,Kovalev, Mikhail. r-process Abundance Patterns in the Globular Cluster M92[J]. ASTROPHYSICAL JOURNAL,2023,958(1). |
| APA | Kirby, Evan N.,Ji, Alexander P.,&Kovalev, Mikhail.(2023).r-process Abundance Patterns in the Globular Cluster M92.ASTROPHYSICAL JOURNAL,958(1). |
| MLA | Kirby, Evan N.,et al."r-process Abundance Patterns in the Globular Cluster M92".ASTROPHYSICAL JOURNAL 958.1(2023). |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| r-process Abundance （4308KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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。
修改评论