Sökning: id:"swepub:oai:DiVA.org:uu-193501" >
The most metal-poor...
The most metal-poor stars. III. The metallicity distribution function and carbon-enhanced metal-poor fraction
-
Yong, David (författare)
-
Norris, John E. (författare)
-
Bessell, M. S. (författare)
-
visa fler...
-
Christlieb, N. (författare)
-
Asplund, M. (författare)
-
Beers, Timothy C. (författare)
-
- Barklem, Paul S. (författare)
- Uppsala universitet,Teoretisk astrofysik
-
Frebel, Anna (författare)
-
Ryan, S. G. (författare)
-
visa färre...
-
(creator_code:org_t)
- 2013
- 2013
- Engelska.
-
Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 762:1, s. 27-
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- early universe
- Galaxy: formation
- Galaxy: halo
- nuclear reactions
- nucleosynthesis
- abundances
- stars: abundances
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas