The optical and ultraviolet spectrum of the planetary nebula NGC 2440

Details The optical and ultraviolet spectrum of the planetary nebula NGC 2440 The optical and ultraviolet spectrum of the planetary nebula NGC 2440

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..569s&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 569-583. NASA-supported research

Astronomy and Astrophysics

Astronomy

115

Astronomical Spectroscopy, Optical Emission Spectroscopy, Planetary Nebulae, Ultraviolet Astronomy, Visible Spectrum, Abundance, Astronomical Models, Charge Transfer, Emission Spectra, Nitrogen, Oxygen, Photoionization

Scientific paper

New measurements of the optical and ultraviolet emission-line intensities of the high-excitation planetary nebula NGC 2440 in the wavelength range 1240-8578 A are analyzed with the aid of photoionization models. The observed O III and N II forbidden-line temperatures (13,800 K and 10,000 K, respectively) differ by more than the models predict. Inclusion of charge-transfer reactions at published rates improves agreement between calculated and observed abundances of many ions, but worsens the agreement for several highly ionized ions. Nitrogen shows a larger overabundance N(N)/N(O) approximately equal to 1.0, whereas ultraviolet lines give a carbon abundance close to the solar value. The refractory elements magnesium, calcium, and iron have similar gas-phase depletions of approximately 1.5 dex. The abundances of oxygen, neon, sodium, sulfur, chlorine, potassium, and argon are rougly solar.

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