NE V abundances in planetary nebulae from infrared lines

Details NE V abundances in planetary nebulae from infrared lines NE V abundances in planetary nebulae from infrared lines

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.207p...7j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 207, March 15, 1984, p. 7P-12P. Research supported by t

Astronomy and Astrophysics

Astronomy

10

Abundance, Infrared Spectra, Ion Density (Concentration), Line Spectra, Neon, Planetary Nebulae, Collision Parameters, Electron Density (Concentration), Electron Energy, Plasma Diagnostics, Radiant Flux Density

Scientific paper

The Ne V 24.28 μm infrared line has been observed in three planetary nebulae by Shure et al. The authors re-analyse their results using the new collision strength calculations. The Ne V abundance is reduced by a factor of 4 for NGC 7354 and 7662, but increased for NGC 7027, suggesting that the electron density derived from high-ionization species in NGC 7027 is overestimated. The Ne V infrared line flux from NGC 7662 is combined with the 3426 Å flux to obtain a Ne V electron temperature of 18500±4500K, removing the discrepancy with model nebulae calculations found by Shure et al. The calculations suggest that the ratio of the 14.3 μm line to the 3426 Å line is a good temperature diagnostic for electron densities <104cm-3.

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