O IV temperature determination for NGC 7662

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Energy, Galactic Nuclei, Oxygen Spectra, Planetary Nebulae, Ultraviolet Astronomy, Active Galactic Nuclei, Emissivity, Hydrogen Clouds

Scientific paper

The authors present a new method for the determination of electron temperatures in high-excitation zones of planetary nebulae and active galactic nuclei. The present study uses the ratio of the O IV line at 25.87 μm to those near 1400 Å to calculate a temperature within the He III zone of NGC 7662. The observed fluxes yield a lower bound to the temperature of 14,730K. This is significantly higher than the O III temperature of ≡12,000K.

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