Fine-structure lines and elemental abundances in the Orion Nebula

Details Fine-structure lines and elemental abundances in the Orion Nebula Fine-structure lines and elemental abundances in the Orion Nebula

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..139l&link_type=abstract

Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 139-142.

Astronomy and Astrophysics

Astronomy

31

Abundance, Astronomical Spectroscopy, Infrared Astronomy, Orion Nebula, Argon, Fine Structure, Neon, Oxygen, Sulfur

Scientific paper

Infrared observations of the forbidden fine-structure lines of Ne II at 12.81 microns, S IV at 10.51 microns, and Ar III at 8.99 microns in the Orion Nebula are presented. These measurements are combined with optical observations of forbidden Ne III, S II, S III, O II, and O III to derive total elemental abundances of neon, sulfur, and oxygen, Ne/H = 7.91, S/H = 7.34, and O/H = 8.60, which are very similar to solar abundances. While the commonly employed ionization correction formula scheme is found to work satisfactorily for neon, the method overcompensates for the abundance of S(3+) and leads to a higher sulfur abundance than is actually present, though the net discrepancy in the elemental abundance of sulfur in Orion is small.

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