Local stellar kinematics from RAVE data: II. Radial Metallicity Gradient

Details Local stellar kinematics from RAVE data: II. Radial Metallicity Gradient Local stellar kinematics from RAVE data: II. Radial Metallicity Gradient

2011-09-29

arxiv.org/abs/1109.6519v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

23 pages, including 7 figures and 4 tables, accepted for publication in MNRAS

Scientific paper

We investigate radial metallicity gradients for a sample of dwarf stars from the RAdial Velocity Experiment (RAVE) Data Release 3 (DR3). We select a total of approximately 17000 F-type and G-type dwarfs using selection of colour, log g, and uncertainty on derived space motion, calculate for each star a probabilistic (kinematic) population assignment to thick or thin disc using space motion, and additionally another (dynamical) assignment using stellar vertical orbital eccentricity. We additionally subsample by colour, to provide samples biased to young thin disc and to older thin disc stars. We derive a metallicity gradient as a function of Galactocentric radial distance, i.e. d[M/H]/dR_m=-0.051+/-0.005 dex kpc^-1, for the youngest sample, F-type stars with vertical orbital eccentricities e_V<=0.04. Samples biased to older thin disc stars show systematically shallower abundance gradients.

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