Galactic abundance gradients from deep spectra of HII regions

TL;DR

This study uses deep spectroscopy of HII regions in the Milky Way to accurately measure electron temperatures and analyze the radial abundance gradients of oxygen, nitrogen, and carbon across the galactic disc.

Contribution

It provides new, precise measurements of chemical abundance gradients in the Milky Way using deep spectra from large telescopes, improving understanding of galactic chemical evolution.

Findings

Radial abundance gradients of O, N, and C are characterized.

Electron temperatures are precisely determined for all nebulae.

Results suggest specific patterns in chemical distribution across the galactic disc.

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.