Abundances of argon, sulfur, and neon in six galactic H II regions from infrared forbidden lines

Details Abundances of argon, sulfur, and neon in six galactic H II regions from infrared forbidden lines Abundances of argon, sulfur, and neon in six galactic H II regions from infrared forbidden lines

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..186h&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 1, 1981, p. 186-199. NASA-NSF-supported research.

Astronomy and Astrophysics

Astronomy

56

Abundance, Galactic Radiation, H Ii Regions, Infrared Spectra, Interstellar Extinction, Nebulae, Argon, Forbidden Bands, Galactic Nuclei, Heavy Elements, Line Spectra, Neon, Radio Sources (Astronomy), Spectroscopy, Spectrum Analysis, Sulfur

Scientific paper

Airborne measurements of the Ar II (6.99 micron) and S III (18.71 micron) forbidden lines for six compact H II regions are presented, as well as ground-based 2-4 micron and 8-13 micron spectroscopy if not already published. From these data and radio data, lower limits to the elemental abundances of Ar, Ne, and S are deduced. G29.9-0.0, at 5 kpc from the galactic center, is overabundant in all these elements. The other five regions (at distances 6-13 kpc from the center) mainly appear to be consistent with standard abundances, with the exception of G75.84 + 0.4 at 10 kpc from the galactic center, which is overabundant in S. However, preliminary results on G12.8-0.2 at 6 kpc from the galactic center suggest a possible underabundance. A large statistical sample of H II regions is required in order to determine if there is a radial gradient in the heavy element abundances of the Galaxy.

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