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The R-Process Alliance: fourth data release from the search for R-process-enhanced stars in the galactic halo

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...

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Main Authors: Holmbeck, Erika M. (Author) , Hansen, Terese T. (Author) , Beers, Timothy C. (Author) , Placco, Vinicius M. (Author) , Whitten, Devin D. (Author) , Rasmussen, Kaitlin C. (Author) , Roederer, Ian U. (Author) , Ezzeddine, Rana (Author) , Sakari, Charli M. (Author) , Frebel, Anna (Author) , Drout, Maria R. (Author) , Simon, Joshua D. (Author) , Thompson, Ian B. (Author) , Bland-Hawthorn, Joss (Author) , Gibson, Brad K. (Author) , Grebel, Eva K. (Author) , Kordopatis, Georges (Author) , Kunder, Andrea (Author) , Meléndez, Jorge (Author) , Navarro, Julio F. (Author) , Reid, Warren A. (Author) , Seabroke, George (Author) , Steinmetz, Matthias (Author) , Watson, Fred (Author) , Wyse, Rosemary F. G. (Author)
Format: Article (Journal)
Language:English
Published: 2020 August 7
In: The astrophysical journal. Supplement series
Year: 2020, Volume: 249, Issue: 2
ISSN:1538-4365
DOI:10.3847/1538-4365/ab9c19
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-4365/ab9c19
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Author Notes:Erika M. Holmbeck, Terese T. Hansen, Timothy C. Beers, Vinicius M. Placco, Devin D. Whitten, Kaitlin C. Rasmussen, Ian U. Roederer, Rana Ezzeddine, Charli M. Sakari, Anna Frebel, Maria R. Drout, Joshua D. Simon, Ian B. Thompson, Joss Bland-Hawthorn, Brad K. Gibson, Eva K. Grebel, Georges Kordopatis, Andrea Kunder, Jorge Meléndez, Julio F. Navarro, Warren A. Reid, George Seabroke, Matthias Steinmetz, Fred Watson, and Rosemary F.G. Wyse
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Summary: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 , instead of the empirically chosen 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 progenitors of these two classes of stars and determine whether these signatures arise from separate astrophysical sources at all. Applying this redefinition to previous RPA data, the number of identified r-II and r-I stars changes to 51 and 121, respectively, from the initial set of data releases published thus far. In this data release, we identify 21 new r-II, 111 new r-I (plus 3 re-identified), and 7 new (plus 1 re-identified) limited-r stars out of a total of 232 target stars, resulting in a total sample of 72 new r-II stars, 232 new r-I stars, and 42 new limited-r stars identified by the RPA to date.
Item Description:Gesehen am 23.09.2020
Physical Description:Online Resource
ISSN:1538-4365
DOI:10.3847/1538-4365/ab9c19

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