The high-excitation region of NGC 7027

Details The high-excitation region of NGC 7027 The high-excitation region of NGC 7027

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390l..93r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. L93-L97.

Astronomy and Astrophysics

Astronomy

2

Electron Energy, Emission Spectra, Infrared Astronomy, Infrared Spectra, Interstellar Matter, Planetary Nebulae, Electron Density (Concentration), Fine Structure, Infrared Radiation, Line Spectra

Scientific paper

The first detections of the Na-IV 9.04-micron and the Ar-V 13.09-micron fine-structure emission lines are reported as observed in the well-studied planetary nebula NGC 7027. The Na-IV 9.04-micron/3242-A line ratio is shown to be an excellent temperature diagnostic for highly ionized regions. With the addition of the Ne-V 24.32-microns/3426-A line ratio, an electron temperature of 22,400 K and an electron density of 4.62 are obtained for the inner He(2+) region of NGC 7027. The Ar-V 13.09-microns/7008-A line ratio in conjunction with the O-IV 25.87-microns/1402-A line ratio gives an electron temperature of 15,400 K and an electron density of = 5.25 in the outer He(2+) region of NGC 7027.

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