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The R-Process Alliance: Fourth Data Release from the Search for R-process-enhanced Stars in the Galactic Halo
Name
Holmbeck_2020_ApJS_249_30.pdf
Description
Published version
Size
3.49 MB
Format
Adobe PDF
Checksum (MD5)
c62f577a106825481cafc6b34f4af56e
Author(s)
Holmbeck, EM
Hansen, TT
Beers, TC
Placco, VM
Whitten, DD
Rasmussen, KC
Roederer, IU
Ezzeddine, R
Sakari, CM
Frebel, A
Journal
Astrophysical Journal, Supplement Series
Publisher
American Astronomical Society
Version
Final published version
Abstract
© 2020. The American Astronomical Society. All rights reserved. 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.
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Persistent DSpace Link
DOI of Published Version
10.3847/1538-4365/ab9c19
