Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..266..368m&link_type=abstract
Star clusters: basic galactic building blocks throughout time and space, Proceedings of the International Astronomical Union, IA
Astronomy and Astrophysics
Astronomy
Stars: Abundances, Stars: Fundamental Parameters, Hertzsprung–Russell Diagram, Open Clusters And Associations: General
Scientific paper
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.
Canto Martins B. L.
da Silva Loureiro L.
de La Reza Ramiro
de Medeiros Jose Renan
de Melo H. F. C.
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