Journal Article

Local stellar kinematics from RAVE data – II. Radial metallicity gradient

B. Coşkunoğlu, S. Ak, S. Bilir, S. Karaali, Ö. Önal, E. Yaz, G. Gilmore and G. M. Seabroke

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 4, pages 2844-2854
Published in print February 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI:
Local stellar kinematics from RAVE data – II. Radial metallicity gradient

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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 17 000 F-type and G-type dwarfs, using a selection of colour, log g and uncertainty in the derived space motion, and calculate for each star a probabilistic (kinematic) population assignment to a 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 toward young thin-disc and older thin-disc stars. We derive a metallicity gradient as a function of Galactocentric radial distance, i.e. d[M/H]/dRm=−0.051 ± 0.005 dex kpc−1, for the youngest sample, F-type stars with vertical orbital eccentricities ev≤ 0.04. Samples biased toward older thin-disc stars show systematically shallower abundance gradients.

Keywords: stars: abundances; Galaxy: abundances; Galaxy: disc; Galaxy: evolution

Journal Article.  5943 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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