{"paper":{"title":"First stars XII. Abundances in extremely metal-poor turnoff stars,and comparison with the giants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"2, 2), 3), 4), 6), 9), B. Barbuy (10), B. Nordstrom (8), B. Plez (5, CSCE, E. Caffau (2), E. Depagne (7), F. Primas (12)((1) CIFIST (2) GEPI, F. Spite (2), H.-G Ludwig (1, J. Andersen (8, JINA, Michigan State University (12) European Southern Observatory), M. Spite (2), Observatoire de la Cote d'Azur (5) GRAAL, Observatoire de Paris (3) INAF- OA Trieste (4) Cassiopee, P. Bonifacio (1, P. Francois (2), P. Molaro (3), R. Cayrel (2), T.C. Beers (11), Universidade de Sao Paulo (11) Department of Physics & Astronomy, Universite de Montpellier (6) Department of Physics & Astronomy, Uppsala Astronomical Observatory (7) Las Cumbres Observatory (8) The Niels Bohr Institute (9) Nordic Optical Telescope (10) IAG, V. Hill (2","submitted_at":"2009-03-24T20:00:02Z","abstract_excerpt":"CONTEXT:The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to understanding the early chemical evolution of the Galaxy. Most existing data are, however, for giant stars which may have experienced internal mixing later. AIMS: We aim to compare the results for giants with new, accurate abundances for all observable elements in 18 EMP turnoff stars. METHODS:VLT/UVES spectra at R ~45,000 and S/N~ 130 per pixel (330-1000 nm) are analysed with OSMARCS model atmospheres and the TURBOSPECTRUM code to derive abundances for C, Mg, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Zn, Sr, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4174","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}