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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Shallow extra mixing in solar twins inferred from Be abundances

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Autor(es):
Tucci Maia, M. [1] ; Melendez, J. [1] ; Castro, M. [2] ; Asplund, M. [3] ; Ramirez, I. [4, 5] ; Monroe, T. R. [1] ; do Nascimento, Jr., J. D. [6, 2] ; Yong, D. [3]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Astron IAG USP, BR-05508900 Sao Paulo, SP - Brazil
[2] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59072970 Natal, RN - Brazil
[3] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611 - Australia
[4] Univ Texas Austin, Dept Astron, Austin, TX 78712 - USA
[5] Univ Texas Austin, McDonald Observ, Austin, TX 78712 - USA
[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 - USA
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 576, APR 2015.
Citações Web of Science: 17
Resumo

Context. Lithium and beryllium are destroyed at different temperatures in stellar interiors. As such, their relative abundances offer excellent probes of the nature and extent of mixing processes within and below the convection zone. Aims. We determine Be abundances for a sample of eight solar twins for which Li abundances have previously been determined. The analyzed solar twins span a very wide range of age, 0.5-8.2 Gyr, which enables us to study secular evolution of Li and Be depletion. Methods. We gathered high-quality UVES/VLT spectra and obtained Be abundances by spectral synthesis of the Be II 313 nm doublet. Results. The derived beryllium abundances exhibit no significant variation with age. The more fragile Li, however, exhibits a monotonically decreasing abundance with increasing age. Therefore, relatively shallow extra mixing below the convection zone is necessary to simultaneously account for the observed Li and Be behavior in the Sun and solar twins. (AU)

Processo FAPESP: 12/24392-2 - Espectroscopia de alta precisão: impacto no estudo de planetas, estrelas, a galáxia e cosmologia
Beneficiário:Jorge Luis Melendez Moreno
Linha de fomento: Auxílio à Pesquisa - Temático