The radial abundance gradients of O, Ne, S and Cl of the Milky Way
  We present preliminary results of the O, Ne, S and Cl abundance gradients of
the Milky Way. We analyze in a homogenous way the physical conditions and
chemical abundances of a sample of 35 H II regions with deep spectra observed
mainly with the GTC and VLT telescopes. The sample covers a range in
Galactocentric distances from 5 to 17 kpc. We reanalyze the O abundance
gradient, obtaining a similar complex shape than previously reported in the
literature. We calculate the Cl abundance gradient including a significantly
larger number of objects than in previous works. Our results show a gradient
for Cl/H of -0.034 dex kpc^-1 and a dispersion around the gradient of 0.14 dex.
We obtain values for the Ne/H and S/H abundance gradients with slopes of -0.038
dex kpc^-1 and -0.046 dex kpc^-1, respectively, with dispersions around the
gradient higher than 0.25 dex. We also report the values for the slopes of the
Cl/O, Ne/O and S/O abundance ratio gradients, which show dispersions around the
gradient up to 0.4 dex. Such high dispersion although may be interpreted as
indications of chemical inhomogeneities in the Galactic ISM, it might be also
an artifact produced by the selected ionization correction factor.
