The High-Excitation Planetary Nebula NGC 7662

Details The High-Excitation Planetary Nebula NGC 7662 The High-Excitation Planetary Nebula NGC 7662

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..242h&link_type=abstract

Astrophysical Journal v.491, p.242

Astronomy and Astrophysics

Astronomy

30

Ism: Abundances, Line: Identification, Ism: Planetary Nebulae: Individual Ngc Number: Ngc 7662

Scientific paper

Wavelengths and identifications have been provided for approximately 300 lines between 3660 and 10125 A in the spectrum of the archetypal bright, high-excitation planetary nebula NGC 7662. These lines are measured with the Hamilton echelle spectrograph at Lick Observatory and are supplemented by image-tube data. Published results are used to construct diagnostic diagrams and derive ionic concentrations. The electron temperature indicated by [O III] is about 12,500 K; the density regimes consist of N epsilon = 5000-17,000 cm-1. Derivation of precise abundances will require appropriate model calculations, but with the aid of homogeneous spherical model procedures we find C to be enhanced, N marginally so if at all, and heavier elements depleted with respect to the Sun. These conclusions are in harmony with those of Barker.

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