Vertical and radial metallicity gradients in high latitude galactic fields with SDSS

Abstract

We used the ugr magnitudes of 1437467 F-G type main-sequence stars with metal abundance -2 5 kpc) in three galactocentric distance intervals, 6 < R <= 10, 10 < R <= 15 and 15 < R <= 20 kpc. The first one corresponding to the interval 6 < R <= 10 kpc is equal to d[Fe/H]/dz = -0.023 +/- 0.006 dex kpc(-1), while the others at larger galactocentric distances are close to zero. We derived synthetic vertical metallicity gradients for 2,230,167 stars and compared them with the observed ones. There is a good agreement between the two sets of vertical metallicity gradients for the thin disc, while they are different for the thick disc. For the halo, the conspicuous difference corresponds to the galactocentric distance interval 6 < R <= 10 kpc, while they are compatible at higher galactocentric distance intervals (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.