Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204.1017r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Sept. 1983, p. 1017-1024. Research supported by th
Astronomy and Astrophysics
Astronomy
14
Cosmic Dust, Emission Spectra, Infrared Astronomy, Infrared Spectra, Planetary Nebulae, Continuous Spectra, Fine Structure, Interstellar Matter, Radio Sources (Astronomy), Spectral Energy Distribution, Sulfur
Scientific paper
8-13-micron spectra of eight moderately extended planetary nebulae have been obtained at a resolution of 0.24 micron using a 20-arcsec circular aperture. More compact planetaries which have been studied in this way generally show a strong continuum due to emission from dust, together with fine structure line emission. In contrast, these more extended objects have very weak continuum emission, and are dominated by fine structure line emission, especially by S IV forbidden lines which in several cases accounts for most of the broad-band 10-micron flux. There appears to be very little warm (equal to or greater than 150 K) dust in some of these objects.
Aitken David K.
Roche Patrick F.
Whitmore Bradley
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