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Main-Sequence and sub-giant stars in the Globular Cluster NGC6397: The complex evolution of the lithium abundance
J. I. González Hernández, P. Bonifacio, E. Caffau +6
Thanks to the high multiplex and efficiency of Giraffe at the VLT we have been able for the first time to observe the Li I doublet in the Main Sequence (MS) stars of a Globular Clu…
Solar abundances and 3D model atmospheres
H. -G. Ludwig, E. Caffau, M. Steffen +3
We present solar photospheric abundances for 12 elements from optical and near-infrared spectroscopy. The abundance analysis was conducted employing 3D hydrodynamical (CO5BOLD) as…
6Li in metal-poor halo stars: real or spurious?
M. Steffen, R. Cayrel, P. Bonifacio +2
The presence of convective motions in the atmospheres of metal-poor halo stars leads to systematic asymmetries of the emergent spectral line profiles. Since such line asymmetries a…
Lithium in the Globular Cluster NGC 6397: Evidence for dependence on evolutionary status
J. I. Gonzalez Hernandez, P. Bonifacio, E. Caffau +6
Most Globular Clusters are believed to host a single stellar populations. They can thus be considered a good place to study the Spite plateau and probe for possible evolutionary mo…
Lithium abundances of Main Sequence and Sub-Giant stars in the Globular Cluster NGC 6397
J. I. González Hernández, P. Bonifacio, E. Caffau +6
We present FLAMES/GIRAFFE spectroscopy obtained at the Very Large Telescope (VLT). Using these observations we have been able for the first time to observe the Li I doublet in the…
First stars XII. Abundances in extremely metal-poor turnoff stars,and comparison with the giants
P. Bonifacio, M. Spite, R. Cayrel +13
CONTEXT:The detailed chemical abundances of extremely metal-poor (EMP) stars are key guides to understanding the early chemical evolution of the Galaxy. Most existing data are, how…
Evolution of the Barium abundance in the early Galaxy from a NLTE analysis of the Ba lines in a homogeneous sample of EMP stars
S. M. Andrievsky, M. Spite, S. A. Korotin +5
Barium is a key element in constraining the evolution of the (not well understood) r-process in the first galactic stars and currently the Ba abundances in these very metal-poor st…