SIMBAD references

2013ApJ...762...27Y - Astrophys. J., 762, 27 (2013/January-1)

The most metal-poor stars. III. The metallicity distribution function and carbon-enhanced metal-poor fraction.

YONG D., NORRIS J.E., BESSELL M.S., CHRISTLIEB N., ASPLUND M., BEERS T.C., BARKLEM P.S., FREBEL A. and RYAN S.G.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): early universe - Galaxy: formation - Galaxy: halo - nuclear reactions, nucleosynthesis, abundances - stars: abundances

VizieR on-line data: <Available at CDS (J/ApJ/762/27): table1.dat>

Simbad objects: 88

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2020.02.17-19:18:38

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