Abundances and ages of the deconvolved thin/thick disks of the Galaxy.

Pascal Girard (1) , C. Soubiran (1)

1 OASU - Observatoire aquitain des sciences de l'univers

We have investigated the abundance of several chemical elements in two large stellar samples kinematically representative of the thin and the thick disks of the Galaxy. Chemical, kinematical and age data have been collected from high quality sources in the literature. Velocities (U,V,W) have been computed and used to select stars with the highest probability to belong to the thin disk and the thick disk respectively. Our results show that the two disks are chemically well separated. Both exhibit a decline of [$\alpha$/Fe] with increasing [Fe/H]. A transition between the thin/thick disks stars is observed at 10 Gyr.

Mots clés: Thin disk; Thick disk; Milky Way; Stellar populations; Alpha elements; Chemical composition; kinematic; abundances

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Pascal Girard, C. Soubiran. Abundances and ages of the deconvolved thin/thick disks of the Galaxy.. 2004. ⟨hal-00003206⟩