Lithium abundances in dwarfs of intermediate age open clusters

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

Autores

G. Pace (Autor) FCUP; J. Melendez (Autor) FCUP

Ata de Conferência Internacional

Título: LIGHT ELEMENTS IN THE UNIVERSE

Páginas: 345-346

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): Lithium abundance measurements in dwarf stars in open clusters ate of crucial importance for our understanding of the mixing mechanism and have allowed us to achieve important conclusions on the matter However. in order to further our understanding of who drives lithium depletion. lithium abundance measurements have to be coupled temperature determinations; which are best achieved when the analysis of iron Imes is employed Effective temperature estimations from photometry, on the contrary; can be affected by errors as large as several hunched kelvins due to uncertain open cluster reddening, especially when studying old open clusters, which tend to be more distant We present lithium abundance in 12 dwarfs belonging to 4 open clusters at about 1 or 2 Gyr. The stellar effective temperatures; along with the (Aim parameters, wet e estimated from the analysis of about, 60 Fe I Imes and 10 Fe II. Even though the few datapoints call for caution; we notice that, stars in the open cluster IC 4651 seem to present a steep decline with temperature below 6000 K

Idioma: Inglês

Tipo (Avaliação Docente): Científica