Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..860w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 860-870. Research supported by National Geographic S
Astronomy and Astrophysics
Astronomy
37
Astronomical Spectroscopy, Cosmic Dust, Infrared Sources (Astronomy), Near Infrared Radiation, Planetary Nebulae, Emission Spectra, H Ii Regions, Infrared Spectra, Spectral Resolution
Scientific paper
Isophote maps derived from spatially resolved moderate spectral resolution images of the planetary nebula NGC 7027 in the 3.28-micron and 3.4-micron 'unidentified' emission features, and in the Br-alpha hydrogen recombination line are presented. Comparison of these images clearly shows that the 3.28-micron emission is spatially more extended than the ionized gas. Analysis and modeling of the spatial distribution of the 3.28-micron feature strength suggest that roughly equal amounts of feature emission appear to come from within the H II region and from a shell outside the H II region. The spatial distribution of the 3.4-micron feature emission is found to be similar to that of the 3.28-micron feature emission.
Forrest William John
Pipher Judith L.
Sellgren Kris
Shure Mark
Woodward Charles E.
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