Abundance Gradients in Spiral Galaxies

  title={Abundance Gradients in Spiral Galaxies},
  author={M. B. Vila-Costas},
The study of HII regions in the disks of spiral galaxies has given us important information about their physical conditions. In particular the study of their chemical abundances soon showed the existence of negative gradients with higher abundance towards the centre of a galaxy (e.g. Pagel and Edmunds 1981; McCall 1982; Diaz 1989; Dinerstein 1990).