The R -Process Alliance: Fourth Data Release from the Search for R -process-enhanced Stars in the Galactic Halo,The Astrophysical Journal Supplement Series

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The R -Process Alliance: Fourth Data Release from the Search for R -process-enhanced Stars in the Galactic Halo
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2020-08-06 , DOI: 10.3847/1538-4365/ab9c19
Erika M. Holmbeck _{1,

2} , Terese T. Hansen _{3,

4} , Timothy C. Beers _{1,

2} , Vinicius M. Placco _{1,

2} , Devin D. Whitten _{1,

2} , Kaitlin C. Rasmussen _{1,

2} , Ian U. Roederer _{2,

5} , Rana Ezzeddine _{2,

6} , Charli M. Sakari ₇ , Anna Frebel _{2,

8} , Maria R. Drout ₉ , Joshua D. Simon ₁₀ , Ian B. Thompson ₁₀ , Joss Bland-Hawthorn ₁₁ , Brad K. Gibson ₁₂ , Eva K. Grebel ₁₃ , Georges Kordopatis ₁₄ , Andrea Kunder ₁₅ , Jorge Melndez ₁₆ , Julio F. Navarro ₁₇ , Warren A. Reid ₁₈ , George Seabroke ₁₉ , Matthias Steinmetz ₂₀ , Fred Watson ₂₁ , Rosemary F. Ġ. Wyse ₂₂

Affiliation

Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
Joint Institute for Nuclear Astrophysics—Center for the Evolution of the Elements (JINA-CEE), East Lansing, MI 48824, USA
George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
Department of Astronomy, University of Florida, Bryant Space Science Center, Gainesville, FL 32611, USA
Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA
Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON, M5S 3H4, Canada
The Observatories of the Carnegie Institution for Science, Pasadena, CA 91101, USA
Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia
E.A. Milne Centre for Astrophysics, University of Hull, Hull, HU6 7RX, UK
Astronomisches Rechen-Institut, Zentrum fr Astronomie der Universitt Heidelberg, Mnchhofstr. 12–14, D-69120 Heidelberg, Germany
Universit Cte d’Azur, Observatoire de la Cte d’Azur, CNRS, Laboratoire Lagrange, Nice, France
Saint Martin’s University, 5000 Abbey Way SE, Olympia, WA 98501, USA
Instituto de Astronomia, Geofsica e Cincias Atmosfricas, Universidade de So Paulo, SP 05508-900, Brazil
Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada
Department of Physics and Astronomy, Macquarie University, Sydney NSW 2109, Australia
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, RH5 6NT, UK
Leibniz Institut fr Astrophysik Potsdam, An der Sterwarte 16, D-14482 Potsdam, Germany
Australian Government, Department of Industry, Innovation, Science, Energy and Resources, North Ryde, NSW 2113, Australia
Johns Hopkins University, Dept of Physics & Astronomy, Baltimore, MD 21218, USA

This compilation is the fourth data release from the R -Process Alliance (RPA) search for r -process-enhanced stars and the second release based on “snapshot” high-resolution ( R ∼ 30,000) spectra collected with the du Pont 2.5 m Telescope. In this data release, we propose a new delineation between the r -I and r -II stellar classes at ##IMG## [http://ej.iop.org/images/0067-0049/249/2/30/apjsab9c19ieqn1.gif] {$[\mathrm{Eu}/\mathrm{Fe}]=+0.7$} , instead of the empirically chosen ##IMG## [http://ej.iop.org/images/0067-0049/249/2/30/apjsab9c19ieqn2.gif] {$[\mathrm{Eu}/\mathrm{Fe}]=+1.0$} level previously in use, based on statistical tests of the complete set of RPA data released to date. We also statistically justify the minimum level of [Eu/Fe] for definition of the r -I stars, [Eu/Fe] > +0.3. Redefining the separation between r -I and r -II stars will aid in the analysis of the possible ...

中文翻译：

R进程联盟：在银河光环中搜索R进程增强的恒星的第四次数据发布

该汇编是R-Process Alliance（RPA）搜索r -process增强的恒星的第四次数据发布，也是第二次基于du Pont 2.5 m望远镜收集的“快照”高分辨率（R〜30,000）光谱的第二次发布。。在此数据发布中，我们建议在＃-IMG ## [http://ej.iop.org/images/0067-0049/249/2/30/ apjsab9c19ieqn1.gif] {$ [\ mathrm {Eu} / \ mathrm {Fe}] = + 0.7 $}，而不是根据经验选择的## IMG ## [http://ej.iop.org/images/0067- 0049/249/2/30 / apjsab9c19ieqn2.gif] {$ [\ mathrm {Eu} / \ mathrm {Fe}] = + 1.0 $}以前使用的级别，基于对发布到以下版本的完整RPA数据的统计测试日期。我们还从统计学上证明最低的[Eu / Fe]水平可以定义r -I星，[Eu / Fe]> +0.3。

更新日期：2020-08-10

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