Far‐Infrared Abundance Measurements in the Outer Galaxy
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Abstract
Five H II regions at large distances from the center of the Galaxy (R \ 1317 kpc) have been observed in the far-IR emission lines of [O III] (52 and 88 km), [N III] (57 km), and [S III] (19 km) using the Kuiper Airborne Observatory. These observations have been combined with Very Large Array radio continuum observations of these sources to determine the abundances of O``, N``, and S``relative to hydrogen. A simple ionization correction scheme has been used to determine the total abundances of nitrogen and sulfur relative to hydrogen, as well as the relative abundance N/O. For the two sources in common with previous optical studies (S127 and S128), we nd good agreement between the far-infrared and optical determinations of N/H, S/H, and N/O.
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