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

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2010

Autores

J. Melendez (Autor) FCUP; L. Casagrande (Autor) FCUP; I. Ramirez (Autor) FCUP; M. Asplund (Autor) FCUP; W.J. Schuster (Autor) Outra

Ata de Conferência Internacional

Título: LIGHT ELEMENTS IN THE UNIVERSE

Páginas: 211-214

268th Symposium of the International-Astronomical-Union

Geneva, Switzerland, 9 a 13 de Novembro de 2009

Indexação

ISI Web of Science

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

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

Idioma: Inglês

Tipo (Avaliação Docente): Científica