Emission features in the spectrum of NGC 7027 near 3.3 microns at very high resolution

Details Emission features in the spectrum of NGC 7027 near 3.3 microns at very high resolution Emission features in the spectrum of NGC 7027 near 3.3 microns at very high resolution

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..195l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 195-200. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

11

Astronomical Spectroscopy, Emission Spectra, Infrared Spectra, Planetary Nebulae, Atomic Recombination, High Resolution, Hydrocarbons, Stellar Spectra

Scientific paper

A very high resolution spectrum is presented of the planetary nebula NGC 7027 over a 200/cm interval centered at 2950/cm, and the features found are described: (1) nebular continuum, (2) atomic recombination lines of H and He II, and (3) three broader emission features of uncertain origin. For the latter the first evidence is presented that the 3.46 micron feature and possibly the 3.40 micron feature are resolvable into a sequence of narrower features. The interpretation of the broader features is discussed in terms of the hypothesis of identification with emission by polycyclic aromatic hydrocarbons.

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