Abundance trends in kinematical groups of the Milky Way's disk

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

1 OASU - Observatoire aquitain des sciences de l'univers

We have compiled a large catalogue of metallicities and abundance ratios from the literature in order to investigate abundance trends of several alpha and iron peak elements in the thin disk and the thick disk of the Galaxy. The catalogue includes 743 stars with abundances of Fe, O, Mg, Ca, Ti, Si, Na, Ni and Al in the metallicity range -1.30 < [Fe/H] < +0.50. We have checked that systematic differences between abundances measured in the different studies were lower than random errors before combining them. Accurate distances and proper motions from Hipparcos, and radial velocities from several sources have been retreived for 639 stars and their velocities (U,V,W) and galactic orbits have been computed. Ages of 322 stars have been estimated with the Bayesian method of isochrone fitting developped by Pont & Eyer (2004). Two samples kinematically representative of the thin and thick disks have been selected, taking into account the Hercules stream which is intermediate in kinematics, but with a probable dynamical origin. [Abridged...]

Mots clés: stars : fundamental parameters; stars : abundances; stars : kinematics; galaxy : disk; galaxy : abundances; galaxy : kinematics and dynamics

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

C. Soubiran, Pascal Girard. Abundance trends in kinematical groups of the Milky Way's disk. 2005. ⟨hal-00004606⟩