Galactic Abundance Gradients fro IR Fine Strucuture LInes in Compact H II regions

Abstract

We present observations of the [S III]19µm, [O III]52 and 88µm, and [N III]57µm lines toward 18 compact and ultracompact (UC) H II regions. These data were combined with data from the literature and high-resolution radio continuum maps to construct detailed statistical equilibrium and ionization equilibrium models of 34 compact H II regions located at galactocentric distances (Dg)0-12kpc. Our models simultaneously fit the observed IR fine-structure lines and high-resolution radio continuum maps.