Determinations of S III, O IV, and NE V abundances in planetary nebulae from infrared lines

Details Determinations of S III, O IV, and NE V abundances in planetary nebulae from infrared lines Determinations of S III, O IV, and NE V abundances in planetary nebulae from infrared lines

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..645s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 645-653.

Astronomy and Astrophysics

Astrophysics

31

Abundance, Forbidden Transitions, Infrared Spectra, Planetary Nebulae, Electron Energy, Ions, Line Spectra, Neon, Oxygen Ions, Sulfur

Scientific paper

Twelve planetary nebulae have been subjected to airborne observations of the S III (18.71 microns), Ne V (24.28 microns) and O IV (25.87 microns) IR forbidden lines, of which one or more lines were detected in seven of the nebulae. These results are insensitive to nebula temperatures, in contrast to optical or UV lines, although density estimates from the latter were required to obtain abundances. The Ne V electron temperature of 11,200 + 2000 or - 1100 K temperature obtained overlaps O III temperature measurements. Since the ionization potential of Ne IV is much greater than that of O II, the electron temperature of Ne V should be much greater than that of O III. This discrepancy may indicate inaccuracies in currently available atomic parameters for Ne V.

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