Local Stellar Kinematics from RAVE Data - VI. Metallicity Gradients Based on the F-G Main-Sequence Stars

Abstract

We estimated iron and metallicity gradients in the radial and vertical directions with the F and G type dwarfs taken from the Radial Velocity Experiment Data Release 4 database. The sample defined by the constraints Z(max) 8 kpc. The range of the iron and metallicity abundance for the F and G type dwarfs on elongated orbits, [-0.13, -0.01), is similar to the thin-disc stars, while at least half of their space velocity components agree better with those of the thick-disc stars. The vertical iron gradients estimated for the F and G type dwarfs on circular orbits are d[Fe/H]/dZ(max) = -0.176 +/- 0.039 dex kpc(-1) and d[Fe/H]/dZ(max) = -0.119 +/- 0.036 dex kpc(-1) for the intervals Z(max) <= 825 and Z(max) <= 1500 pc, respectively.