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The R-Process Alliance: Chemodynamically Tagged Groups of Halo r-process-enhanced Stars Reveal a Shared Chemical-evolution History
Gudin, Dmitrii1,2,3; Shank, Derek1,2; Beers, Timothy C.1,2; Yuan, Zhen4; Limberg, Guilherme5; Roederer, Ian U.2,6; Placco, Vinicius1,2,7; Holmbeck, Erika M.1,2,8; Dietz, Sarah1,2; Rasmussen, Kaitlin C.1,2,6; Hansen, Terese T.9,10; Sakari, Charli M.11; Ezzeddine, Rana2,12,13,14; Frebel, Anna2,12,13
2021-02-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume908Issue:1Pages:21
AbstractWe derive dynamical parameters for a large sample of 446 r-process-enhanced (RPE) metal-poor stars in the halo and disk systems of the Milky Way, based on data releases from the R-Process Alliance, supplemented by additional literature samples. This sample represents more than a 10-fold increase in size relative to that previously considered by Roederer et al. and, by design, covers a larger range of r-process-element enrichment levels. We test a number of clustering analysis methods on the derived orbital energies and other dynamical parameters for this sample, ultimately deciding on application of the HDBSCAN algorithm, which obtains 30 individual chemodynamically tagged groups (CDTGs); 21 contain between 3 and 5 stars, and 9 contain between 6 and 12 stars. Even though the clustering was performed solely on the basis of their dynamical properties, the stars in these CDTGs exhibit statistically significant similarities in their metallicity ([Fe/H]), carbonicity ([C/Fe]), and neutron-capture element ratios ([Sr/Fe], [Ba/Fe], and [Eu/Fe]). These results demonstrate that the RPE stars in these CDTGs have likely experienced common chemical-evolution histories, presumably in their parent satellite galaxies or globular clusters, prior to being disrupted into the Milky Way's halo. We also confirm the previous claim that the orbits of the RPE stars preferentially exhibit pericentric distances that are substantially lower than the present distances of surviving ultrafaint dwarf and canonical dwarf spheroidal galaxies, consistent with the disruption hypothesis. The derived dynamical parameters for several of our CDTGs indicate their association with previously known substructures, dynamically tagged groups, and RPE groups.
KeywordDwarf galaxies Milky Way stellar halo Stellar dynamics Stellar abundances Stellar populations R-process
Funding OrganizationPhysics 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University
DOI10.3847/1538-4357/abd7ed
Language英语
Funding ProjectPhysics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) - US National Science Foundation[PHY 14-30152] ; NSF[AST-1815403] ; CAPES (PROEX)[88887.481172/2020-00] ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University
Funding OrganizationPhysics 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; 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 ; CAPES (PROEX) ; CAPES (PROEX) ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University ; George P. and Cynthia Woods Institute for Fundamental Physics and Astronomy at Texas AM University
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000618784200001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79520
Collection中国科学院国家天文台
Corresponding AuthorGudin, Dmitrii
Affiliation1.Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
2.Joint Inst Nucl Astrophys, Ctr Evolut Elements JINA CEE, E Lansing, MI USA
3.Univ Maryland, Dept Math, College Pk, MD 20742 USA
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508090 Sao Paulo, SP, Brazil
6.Univ Michigan, Dept Astron, 1085 S Univ Ave, Ann Arbor, MI 48109 USA
7.NSFs Natl Opt Infrared Astron Res Lab, Tucson, AZ 85719 USA
8.Rochester Inst Technol, Ctr Computat Relat & Gravitat, Rochester, NY 14623 USA
9.Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA
10.Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
11.San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA
12.MIT, Dept Phys, Cambridge, MA 02139 USA
13.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
14.Univ Florida, Bryant Space Sci Ctr, Dept Astron, Gainesville, FL 32611 USA
Recommended Citation
GB/T 7714
Gudin, Dmitrii,Shank, Derek,Beers, Timothy C.,et al. The R-Process Alliance: Chemodynamically Tagged Groups of Halo r-process-enhanced Stars Reveal a Shared Chemical-evolution History[J]. ASTROPHYSICAL JOURNAL,2021,908(1):21.
APA Gudin, Dmitrii.,Shank, Derek.,Beers, Timothy C..,Yuan, Zhen.,Limberg, Guilherme.,...&Frebel, Anna.(2021).The R-Process Alliance: Chemodynamically Tagged Groups of Halo r-process-enhanced Stars Reveal a Shared Chemical-evolution History.ASTROPHYSICAL JOURNAL,908(1),21.
MLA Gudin, Dmitrii,et al."The R-Process Alliance: Chemodynamically Tagged Groups of Halo r-process-enhanced Stars Reveal a Shared Chemical-evolution History".ASTROPHYSICAL JOURNAL 908.1(2021):21.
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