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Lithium survey in evolved stars observed in the sacy project

Published online by Cambridge University Press:  18 January 2010

B. L. Canto Martins
Affiliation:
DFTE/UFRN, Natal, RN, Brazil
S. Vieira
Affiliation:
Laboratório Nacional de Astrofísica, Itajubá, MG, Brazil
C. A. O. Torres
Affiliation:
Laboratório Nacional de Astrofísica, Itajubá, MG, Brazil
G. R. Quast
Affiliation:
Laboratório Nacional de Astrofísica, Itajubá, MG, Brazil
L. da Silva
Affiliation:
Observatório Nacional, Rio de Janeiro, RJ, Brazil
R. de La Reza
Affiliation:
Observatório Nacional, Rio de Janeiro, RJ, Brazil
C. H. F. de Melo
Affiliation:
European Southern Observatory, La Silla, Chile
J. R. de Medeiros
Affiliation:
DFTE/UFRN, Natal, RN, Brazil
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Abstract

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The primary goal of the sacy project (Search for Associations Containing Young Stars) was to identify possible associations of stars younger than the Pleiades association among optical counterparts of ROSAT X-ray-bright sources. The study of the chemical abundance in stars located in regions of stellar formation is extremely important to understand stellar nucleo-synthesis, the physical mechanisms controlling mixing in stellar interiors, and chemical enrichment in the Galaxy. The present work highights the first results of a chemical-abundance study of evolved stars identified in the sacy survey. For this, we performed a detailed spectroscopic analysis for the determination of atmospheric parameters and Li abundance for a sample of giant and subgiant stars. The observations were carried out with high resolution using the FEROS (R = 48 000) échelle spectrograph. We measured the stellar parameters (Teff, log g, vmic, [Fe/H]) from LTE analysis in the complete range of 420-1100 nm. Li abundance was derived from the region around the lithium line at 6707.78 Å for the entire sample of stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010