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).
文献类型：期刊论文
| 作者 | Placco,Vinicius M.13,14; Santucci,Rafael M.15,16; Yuan,Zhen1; Mardini,Mohammad K.2,3; Holmbeck,Erika M.13,14; Wang,Xilu4,13,14; Surman,Rebecca13,14; Hansen,Terese T.5; Roederer,Ian U.6,14; Beers,Timothy C.13,14 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 897期号:1 |
| 关键词 | Chemical abundances Stellar atmospheres Stellar kinematics R-process CEMP stars Metallicity |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab99c6 |
| 英文摘要 | Abstract 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. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-897-1-AB99C6 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63094]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, People’s Republic of China 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People’s Republic of China 4.Department of Physics, University of California, Berkeley, CA 94720, USA 5.Mitchell Institute for Fundamental Physics and Astronomy and Department of Physics and Astronomy, Texas A & M University, College Station, TX 77843, USA 6.Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA 7.Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Kobe, Hyogo 658-8501, Japan 8.Geneva Observatory, University of Geneva, Maillettes 51, CH-1290 Sauverny, Switzerland 9.Observatories of the Carnegie Institution for Science, Pasadena, CA 91101, USA 10.Department of Astronomy, University of Florida, Bryant Space Science Center, Gainesville, FL 32611, USA |
| 推荐引用方式 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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