Galactic abundance gradients from deep spectra of HII regions

Abstract: We present some results of an ongoing project devoted to reassess the radial abundance gradients in the disc of the MilkyWay based on deep spectroscopy of Hii regions. The data have been taken with large aperture telescopes, mainly with the GTC and VLT. The sample contains about 35 objects located at Galactocentric distances from 5 to 17 kpc. We determine the electron temperature for all nebulae, allowing the precise calculation of chemical abundances. In this paper, we present and discuss results mostly concerning the radial gradients of O, N and C.