Observations of NGC 7027 from 5.2 to 7.5 microns - The detection of NI II and additional dust features

Details Observations of NGC 7027 from 5.2 to 7.5 microns - The detection of NI II and additional dust features Observations of NGC 7027 from 5.2 to 7.5 microns - The detection of NI II and additional dust features

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..666b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 666-670.

Astronomy and Astrophysics

Astronomy

44

Cosmic Dust, Infrared Astronomy, Line Spectra, Planetary Nebulae, Emission Spectra, Fine Structure, Nickel, Spectral Resolution

Scientific paper

The authors have observed NGC 7027 with a multichannel grating spectrometer from 5.2 to 7.5 μm at a spectral resolving power of 120 - 200. Two new dust emission features are resolved at 5.62 and 6.95 μm, and for the first time the Ni II fine-structure line at 6.64 μm is detected. It is shown that a single molecular dust constituent might account for six of the nine observed dust features between 2 and 14 μm. The strength of the Ni II line indicates either that Ni is not depleted in the neutral gas, or that the line is formed at high density.

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