Observational signatures for depletion in the Spite plateau: solving the cosmological Li discrepancy?

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

J. Melendez (Author) FCUP; L. Casagrande (Author) FCUP; I. Ramirez (Author) FCUP; M. Asplund (Author) FCUP; W.J. Schuster (Author) Other

Conference proceedings International

Title: LIGHT ELEMENTS IN THE UNIVERSE

Pages: 211-214

268th Symposium of the International-Astronomical-Union

Geneva, Switzerland, 9 a 13 de Novembro de 2009

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ISI Web of Science

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Abstract (EN): We present Li abundances for 73 stars in the metallicity range 3.5 < [Fe/H] < ;-1 0 using improved I RPM temperatures (Casagrande et at 2010) with precise E(B-V) values obtained mostly nom interstellar Nab D. lines, and high-quality equivalent widths (sigma(EW) similar to 3 At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we Li ace to Li depletion that depends on both metallicity and mass Models including atomic diffusion and turbulent, mixing seem to reproduce the observed Li depletion assuming a primordial dial Li abundance A(Li) = 2.64 dex (MARCS models) or 2 72 (Kurucz overshooting models), in good agreement with current, predictions (A(Li) = 2 72) flow standard BBN We are currently expanding our sample to have a better coverage of different evolutionary stages at the high and low metallicity ends, in order to verify our findings

Language: English

Type (Professor's evaluation): Scientific