Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340812k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #408.12; Bulletin of the American Astronomical Society, Vol. 41, p.207
Astronomy and Astrophysics
Astrophysics
Scientific paper
The chemical evolution of the Galaxy and the early Universe is a key topic in modern astrophysics. The most metal-poor Galactic halo stars are now frequently used in an attempt to reconstruct the onset of the chemical and dynamical formation processes of the Galaxy. These stars are an easily-accessible local equivalent of the high-redshift Universe, and are used to carry out near-field cosmology.
We present an abundance analysis of 18 metal-poor stars selected from the bright sample of the Hamburg/ESO survey. 6 stars have Fe abundances of [Fe/H]<-3.0, the lowest one having [Fe/H] -3.8, which allows us to probe the earliest times of the chemical history of the Galaxy. We find scaled solar abundances down to [Fe/H]=-3.8, in line with previous results that the ISM was well-mixed already at the earliest times. We also focus on particularly carbon-poor metal-poor stars to test a recent fine-structure line cooling theory for the formation of the very first-low mass stars (M<1; Msun) in the Universe. We find that our low carbon abundances thus far support this theory.
Support from the McDonald Observatory's Board of Visitors and W.J.McDonald Fellowship is gratefully acknowledged.
Frebel Anna
Kang Sungsam
Krugler Julie A.
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