Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..605w&link_type=abstract
Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 605-614.
Astronomy and Astrophysics
Astronomy
29
H Ii Regions, Infrared Astronomy, Nitrogen Ions, Oxygen Spectra, Planetary Nebulae, Spectral Line Width, Abundance, Electron Density Profiles, Emission Spectra, Far Infrared Radiation, Fine Structure
Scientific paper
Measurements of 0++ and N++ fine structure lines in several galactic H II regions and planetary nebulae are reported. Emission from [O III] 51.8 μm was detected in the diffuse nebulae Ml7, W43, W49, W5l, and NGC 7538, and marginally in the planetary nebula NGC 6543, with upper limits obtained for the compact H II region DR 21 and the planetary nebulae M57 (NGC 6720) and NGC 7027. The [N III] 57.3 μm line was detected in Ml7 and W5l. Preliminary maps were made of Ml7 and W51 in the [O III] 51.8 μm line, and of Ml7 in the [N III] 57.3 μm line. We combine the present results with previous [O III] 88.4 m data to obtain electron densities in Ml7, W49, W5l, and NGC 7538, and N++/O++ abundance ratios in Ml7 and W5l. The implications of these measurements with regard to the ionization conditions in the nebulae are discussed.
Haller Elmar
Storey John W. V.
Townes Charles H.
Watson Dan M.
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