# Abundances for metal-poor stars with accurate parallaxes - II. $\alpha-$elements in the halo

@article{Gratton2003AbundancesFM,
title={Abundances for metal-poor stars with accurate parallaxes - II. \$\alpha-\$elements in the halo},
author={R. Gratton and E. Carretta and S. Desidera and S. Lucatello and P. Mazzei and M. T. I. A. Padova and Italy. and Dip. Astr. and U. Padova and Cisas Univ. Padova},
journal={Astronomy and Astrophysics},
year={2003},
volume={406},
pages={131-140}
}
Abundances for α−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 metal-poor stars in the solar neighborhood. Based on kinematics, we separated stars into two populations: the first one has a positive velocity of rotation around the galactic center, and it is likely to be related to the dissipational collapse of the galaxy; the second one has either negligible or negative rotational… Expand
96 Citations