Other
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..895s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 895-908.
Other
42
Astronomical Models, Astronomical Spectroscopy, Infrared Spectra, Ionization Cross Sections, Line Spectra, Orion Nebula, Abundance, Electron Density (Concentration), Radio Spectra, Visible Spectrum
Scientific paper
Observations of the forbidden O III 52 and 88 microns lines and the forbidden N III 57 microns line have been made at six positions and the forbidden Ne III 36 microns line at four positions in the Orion Nebula to probe its ionization structure. The wavelength of the forbidden Ne III line was measured to be 36.009-36.017 microns. Electron densities and abundance ratios of N(++)/O(++) have been calculated and compared to other radio and optical observations. Detailed one-component and two-component (bar plus halo) spherical models were calculated for exciting stars with effective temperatures of 37,000-40,000 K and log g = 4.0 and 4.5. Both the new IR observations and the visible line measurements of oxygen and nitrogen require Teff of no more than 37,000 K. However, the doubly ionized neon requires a model with Teff of at least 39,000 K, which is more consistent with that inferred from the radio flux or spectral type. These differences in Teff are not due to effects of dust on the stellar radiation field but are probably due to inaccuracies in the assumed stellar spectrum. Neon and nitrogen are approximately solar, but oxygen is half-solar in abundance. From the IR O(++) lines, it is concluded that the ionization bar results from an increase in column depth rather than from a local density enhancement.
Erickson Edwin F.
Haas Michael R.
Rubin Robert H.
Simpson Janet P.
No associations
LandOfFree
The ionization structure of the Orion Nebula - Infrared line observations and models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The ionization structure of the Orion Nebula - Infrared line observations and models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The ionization structure of the Orion Nebula - Infrared line observations and models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1121580