(Fe II) emission from high-density regions in the Orion Nebula

Details (Fe II) emission from high-density regions in the Orion Nebula (Fe II) emission from high-density regions in the Orion Nebula

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432l.135b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 432, no. 2, p. L135-L138

Astronomy and Astrophysics

Astrophysics

31

Abundance, Emission Spectra, Infrared Spectra, Iron, Orion Nebula, Space Density, Visible Spectrum, Ferric Ions, Forbidden Bands, H Ii Regions, Interstellar Matter

Scientific paper

Direct spectroscopic evidence of high-density regions in the Orion Nebula, Ne approximately equals 105-107/cu cm, is obtained from the forbidden optical and near-IR (Fe II) emission lines, using new atomic data. Calculations for level populations and line ratios are carried out using 16, 35, and 142 level collisional-radiative models for Fe II. Estimates of Fe(+) abundances derived from the near-infrared and the optical line intensities are consistent with a high density of 106/cu cm in the (Fe II) emitting regions. Important consequences for abundance determinations in the nebula are pointed out.

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