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r-process Abundance Patterns in the Globular Cluster M92

文献类型：期刊论文

作者Kirby, Evan N.5; Ji, Alexander P.3,4; Kovalev, Mikhail1,2
刊名ASTROPHYSICAL JOURNAL
出版日期2023-11-01
卷号958期号:1
ISSN号0004-637X
DOI10.3847/1538-4357/acf309
产权排序第4完成单位
文献子类Article
英文摘要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.
学科主题天文学
URL标识查看原文
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
WOS关键词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
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
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP Publishing Ltd
WOS记录号WOS:001123547100001
资助机构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
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/26446]  
专题云南天文台_大样本恒星演化研究组
云南天文台_中国科学院天体结构与演化重点实验室
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.Yunnan Observatories, China Academy of Sciences, Kunming 650216, People's Republic of China;
3.Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA;
4.Department of Astronomy & Astrophysics, University of Chicago, 5640 S Ellis Avenue, Chicago, IL 60637, USA;
5.Department of Physics and Astronomy, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556, USA; ekirby@nd.edu;
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).

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来源：云南天文台

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