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The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5?455510**Based on observations gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 099.D-0428(A).
Placco,Vinicius M.1,2; Santucci,Rafael M.3,4; Yuan,Zhen5; Mardini,Mohammad K.6,7; Holmbeck,Erika M.1,2; Wang,Xilu1,2,8; Surman,Rebecca1,2; Hansen,Terese T.9; Roederer,Ian U.2,10; Beers,Timothy C.1,2; Choplin,Arthur11,12; Ji,Alexander P.13; Ezzeddine,Rana14; Frebel,Anna2,15; Sakari,Charli M.16; Whitten,Devin D.1,2; Zepeda,Joseph1,2
2020-07-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume897Issue:1
AbstractAbstract We report on the spectroscopic analysis of RAVE J183013.5?455510, an extremely metal-poor star, highly enhanced in CNO, and with discernible contributions from the rapid neutron-capture process. There is no evidence of binarity for this object. At ?=??3.57, this star has one of the lowest metallicities currently observed, with 18 measured abundances of neutron-capture elements. The presence of Ba, La, and Ce abundances above the solar system r-process predictions suggests that there must have been a non-standard source of r-process elements operating at such low metallicities. One plausible explanation is that this enhancement originates from material ejected at unusually high velocities in a neutron star merger event. We also explore the possibility that the neutron-capture elements were produced during the evolution and explosion of a rotating massive star. In addition, based on comparisons with yields from zero-metallicity faint supernova, we speculate that RAVE J1830?4555 was formed from a gas cloud pre-enriched by both progenitor types. From analysis based on Gaia DR2 measurements, we show that this star has orbital properties similar to the Galactic metal-weak thick-disk stellar population.
KeywordChemical abundances Stellar atmospheres Stellar kinematics R-process CEMP stars Metallicity
DOI10.3847/1538-4357/ab99c6
Language英语
WOS IDIOP:0004-637X-897-1-ab99c6
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/63095
Collection中国科学院国家天文台
Affiliation1.Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA; vplacco@nd.edu
2.JINA Center for the Evolution of the Elements, USA
3.Instituto de Estudos Sócio-Ambientais, Planetário, Universidade Federal de Goiás, Goiania, GO 74055-140, Brazil
4.Instituto de Física, Universidade Federal de Goiás, Campus Samambaia, Goiania, GO 74001-970, Brazil
5.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China
6.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China
7.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
8.Department of Physics, University of California, Berkeley, CA 94720, USA
9.Mitchell Institute for Fundamental Physics and Astronomy and Department of Physics and Astronomy, Texas A & M University, College Station, TX 77843, USA
10.Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
11.Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Kobe, Hyogo 658-8501, Japan
12.Geneva Observatory, University of Geneva, Maillettes 51, CH-1290 Sauverny, Switzerland
13.Observatories of the Carnegie Institution for Science, Pasadena, CA 91101, USA
14.Department of Astronomy, University of Florida, Bryant Space Science Center, Gainesville, FL 32611, USA
15.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
16.Department of Physics & Astronomy, San Francisco State University, San Francisco, CA 94132, USA
Recommended Citation
GB/T 7714
Placco,Vinicius M.,Santucci,Rafael M.,Yuan,Zhen,et al. The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5?455510**Based on observations gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 099.D-0428(A).[J]. The Astrophysical Journal,2020,897(1).
APA Placco,Vinicius M..,Santucci,Rafael M..,Yuan,Zhen.,Mardini,Mohammad K..,Holmbeck,Erika M..,...&Zepeda,Joseph.(2020).The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5?455510**Based on observations gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 099.D-0428(A)..The Astrophysical Journal,897(1).
MLA Placco,Vinicius M.,et al."The R-process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5?455510**Based on observations gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO program 099.D-0428(A).".The Astrophysical Journal 897.1(2020).
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