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


Coskunoglu B. , Ak S. , Bilir S. , Karaali S., Onal Ö. , Yaz E. , ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.419, ss.2844-2854, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 419 Konu: 4
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1111/j.1365-2966.2011.19925.x
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Sayfa Sayıları: ss.2844-2854

Özet

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 e(v) <= 0.04. Samples biased toward older thin-disc stars show systematically shallower abundance gradients.