Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930402c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #304.02
Astronomy and Astrophysics
Astronomy
Scientific paper
The first metals in our Universe were created and distributed by stars we still know very little about. Before these metals were incorporated in the second generation of stars, they were (presumably) stored within a large reservoir of gas. In this talk, I will present the results from my ongoing survey to search for this `missing-link' by targeting near-pristine damped Lyman-alpha systems (DLAs) at z 3. I report the discovery of a few systems that exhibit an abundance pattern inline with model calculations of metal-free nucleosynthesis, including notable enhancements in their C/Fe ratio; such an abundance pattern is akin to the carbon-enhanced metal-poor stars seen in the halo of our Galaxy. For the full sample of DLAs in this survey, I reinvestigate the trends of [C/O] and [O/Fe] with metallicity, and compare my findings to the recent measures of the abundances of C, O, and Fe from Galactic halo stars. I comment on the new insight this has afforded on the nature of the much-debated trends of these ratios when [Fe/H] < -2.0.
Cooke Ryan J.
Pettini Marco
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