In:
The Astrophysical Journal, American Astronomical Society, Vol. 870, No. 2 ( 2019-01-10), p. 122-
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 ( , , and ), 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.
Type of Medium:
Online Resource
ISSN:
0004-637X
,
1538-4357
DOI:
10.3847/1538-4357/aaf3b9
Language:
Unknown
Publisher:
American Astronomical Society
Publication Date:
2019
detail.hit.zdb_id:
2960-9
detail.hit.zdb_id:
1473835-1
SSG:
16,12
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