The Most Metal-Poor Stars. III. The Metallicity Distribution Function and CEMP Fraction
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Author(s)
Frebel, Anna L.
Yong, David
Norris, John E.
Bessell, M. S.
Christlieb, N.
Asplund, M.
Beers, Timothy C.
Barklem, P. S.
Ryan, S. G.
Alternative Title
The Most Metal-Poor Stars. III. The Metallicity Distribution Function and Carbon-Enhanced Metal-Poor Fraction
Date Issued
December 2012
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Yong, David et al. “The Most Metal-Poor Stars. III. The Metallicity Distribution Function and Carbon-Enhanced Metal-Poor Fraction.” The Astrophysical Journal 762.1 (2013): 27.
Version
Author's final manuscript
Abstract
We examine the metallicity distribution function (MDF) and fraction of carbon-enhanced metal-poor (CEMP) stars in a sample that includes 86 stars with [Fe/H] ≤ –3.0, based on high-resolution, high signal-to-noise spectroscopy, of which some 32 objects lie below [Fe/H] = –3.5. After accounting for the completeness function, the "corrected" MDF does not exhibit the sudden drop at [Fe/H] = –3.6 that was found in recent samples of dwarfs and giants from the Hamburg/ESO survey. Rather, the MDF decreases smoothly down to [Fe/H] = –4.1. Similar results are obtained from the "raw" MDF. We find that the fraction of CEMP objects below [Fe/H] = –3.0 is 23% ± 6% and 32% ± 8% when adopting the Beers & Christlieb and Aoki et al. CEMP definitions, respectively. The former value is in fair agreement with some previous measurements, which adopt the Beers & Christlieb criterion.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1088/0004-637X/762/1/27
