The distribution of S IV and NE II in NGC 7027

Details The distribution of S IV and NE II in NGC 7027 The distribution of S IV and NE II in NGC 7027

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..548b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Oct.-Nov. 1978, p. 548-551.

Astronomy and Astrophysics

Astronomy

5

Abundance, Infrared Astronomy, Neon, Planetary Nebulae, Sulfur, Emission Spectra, Gas Density, Gas Ionization, Line Spectra, Spatial Distribution

Scientific paper

Results are reported for measurements of the S IV 10.5-micron and Ne II 12.8-micron IR emission lines at four positions in NGC 7027 and of the Ar III 9.0-micron line at one position in the same planetary nebula. Ionic abundances are calculated using the data obtained at one position and are combined with published optical data for other ionization states to obtain total elemental abundances. The S IV and Ne II line-intensity distributions are compared with an 8.1-GHz radio map of the nebula. The S IV distribution indicates a density of about 500,000 per cu cm, and the Ne II is found to be contained in low-ionization regions distributed inhomogeneously throughout the nebula. The total abundances relative to hydrogen are determined to be 0.000015 for S, 0.000053 for Ne, and 0.000007 for Ar; these abundances are shown to be within the range of published average values for planetary nebulae.

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