Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203p...9r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 203, Apr. 1983, p. 9P-13P. Research supported by the Science and Engine
Astronomy and Astrophysics
Astronomy
5
Astronomical Spectroscopy, Infrared Astronomy, Planetary Nebulae, Abundance, Continuous Spectra, Emission Spectra, Line Spectra
Scientific paper
An 8-13 micron spectrum of the planetary nebula IC 2165 is presented. In addition to a bright S IV forbidden emission line, weak emission from the A III and Cl IV fine structure forbidden lines and the H7-6 hydrogen recombination line is identified. These lines are used to derive ionic abundances which are in agreement with those expected from the known excitation of the nebula. The rather weak continuum is attributed to free-free emission near 8 microns, but with increasing contributions from dust emission with increasing wavelength. From the presence of emission from silicon carbide dust, it is inferred that the emitting dust grains were formed in a carbon-rich environment, in accord with abundance determinations from optical and ultraviolet line emission.
Aitken David K.
Roche Patrick F.
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