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The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey

Author(s)
Ezzeddine, Rana; Frebel, Anna L.
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Abstract
We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R ∼ 1200-2000) spectroscopy of 857 candidates, we estimate the stellar atmospheric parameters (Teff, log, g, and [Fe/H]), as well as carbon and α-element abundances. We find that 69% of the observed stars have ≤ -1.0, 39% have ≤ -2.0, and 2% have ≤ -3.0. There are also 133 carbon-enhanced metal-poor (CEMP) stars in this sample, with 97 CEMP Group I and 36 CEMP Group II stars identified in the A(C) versus [Fe/H] diagram. A subset of the confirmed low-metallicity stars were followed-up with high-resolution spectroscopy, as part of the R-process Alliance, with the goal of identifying new highly and moderately r-process-enhanced stars. Comparison between the stellar atmospheric parameters estimated in this work and from high-resolution spectroscopy exhibit good agreement, confirming our expectation that medium-resolution observing campaigns are an effective way of selecting interesting stars for further, more targeted, efforts.
Date issued
2019-01
URI
https://hdl.handle.net/1721.1/128688
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Citation
Placco, Vinicius M. et al. “The R-Process Alliance: Spectroscopic Follow-up of Low-metallicity Star Candidates from the Best & Brightest Survey.” Astrophysical Journal, 870, 2 (January 2019): 122 © 2019 The Author(s)
Version: Final published version
ISSN
0004-637X

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