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Heavy elements abundances in turn-off stars and early subgiants in NGC 6752
G. James, P. Francois, P. Bonifacio +12
High resolution spectra (R > 40 000) for 9 main sequence turn-off stars and 9 subgiants in the globular cluster NGC 6752 were acquired with UVES on the VLT-Kueyen (UT2). These data…
Abundances for metal-poor stars with accurate parallaxes II. alpha-elements in the halo
Raffaele Gratton, Eugenio Carretta, Silvano Desidera +3
Abundances for alpha-elements and Fe in about 150 field subdwarfs and early subgiants with accurate parallaxes and kinematic data are used to discuss the run of abundance ratios in…
A search for planets in the metal-enriched binary HD 219542
S. Desidera, R. G. Gratton, M. Endl +6
The components of the wide binary HD 219542 were recently found to differ in metallicity by about 0.1 dex (Gratton et al. A&A 377, 123). In this paper, we present the results of 2…
Abundances for metal-poor stars with accurate parallaxes I. Basic data
Raffaele Gratton, Eugenio Carretta, Riccardo Claudi +2
We present element-to-element abundance ratios measured from high dispersion spectra for 150 field subdwarfs and early subgiants with accurate Hipparcos parallaxes (errors <20%). F…