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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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
American Astronomical Society
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)
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