Measurements of the Far-Infrared [N III] and [O III] Lines in the Outer-Galaxy H II Regions S 206, S 209, and S 212

Details Measurements of the Far-Infrared [N III] and [O III] Lines in the Outer-Galaxy H II Regions S 206, S 209, and S 212 Measurements of the Far-Infrared [N III] and [O III] Lines in the Outer-Galaxy H II Regions S 206, S 209, and S 212

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3411d&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #34.11; Bulletin of the American Astronomical Society, Vol. 25, p.850

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We report measurements of the far-infrared, fine-structure lines [O III] 52, 88 microns, and [N III] 57 microns in three H II regions in the outer Milky Way. The observations were made with a cooled grating spectrometer from NASA's Kuiper Airborne Observatory. This line trio allows one to determine both the gas density and the N/O abundance as traced by the ratio N(++) /O(++) . We measured all three lines from the regions S 206, S 212, and S 209, located at galactocentric distances of 11.5, 14, and 16 kpc, respectively, assuming a solar galactocentric distance of 8.5 kpc. The [O III] electron densities in these H II regions range from log ne = 1.8 to 2.5. For the recently revised collision strength for the [N III] 57 microns line (Blum and Pradhan 1992, Ap.J.Suppl., 80, 425), the mean value for the ionic N/O ratio in these three regions is N(++) /O(++) = 0.13 +/- 0.03. Our results for these outer-galaxy regions will be compared with N/O abundances derived from the far-infrared lines for H II regions in the inner part of the Galaxy. This research was supported by NASA Airborne Astronomy grant NAG2-372.

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