Far-infrared forbidden O III fine-structure lines and ionization structure of RCW 38

Details Far-infrared forbidden O III fine-structure lines and ionization structure of RCW 38 Far-infrared forbidden O III fine-structure lines and ionization structure of RCW 38

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..832t&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Aug. 1987, p. 832-835.

Astronomy and Astrophysics

Astronomy

2

Far Infrared Radiation, Fine Structure, H Ii Regions, Hydrogen Clouds, Line Spectra, Oxygen Ions, Abundance, Astronomical Models, Continuous Spectra, Electron Density (Concentration), Ion Recombination, Radio Spectra

Scientific paper

A pair of fine-structure lines of doubly ionized oxygen [O III] 51.8 μm and 88.4 μm have been detected in a southern H II region, RCW 38. A model of the density structure of ionized gas was constructed with the measured line ratio, referring to observations of radio continuum and recombination lines. It is found that there are high-density components of ne = 50,000 cm-3 in a low-density ambient gas of ne = 150 cm-3. This model gives the abundance of oxygen, O/H = 8×10-4, which is in good agreement with the cosmic abundance.

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