8-13 micron spectrophotometry of compact planetary nebulae and emission line objects

Details 8-13 micron spectrophotometry of compact planetary nebulae and emission line objects 8-13 micron spectrophotometry of compact planetary nebulae and emission line objects

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..217a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 217-237. Research supported by the Science and Engin

Astronomy and Astrophysics

Astronomy

122

Emission Spectra, Infrared Spectra, Line Spectra, Planetary Nebulae, Spectrophotometry, Abundance, Fine Structure, Infrared Astronomy, Infrared Spectrophotometers, Silicates, Silicon Carbides

Scientific paper

8-13 micron spectra are presented of 24 planetary nebulae and other emission line objects, 19 of which are published here for the first time. This brings the total of planetary nebulae for which such spectra are available to 23 including four classed as very low excitation (VLE) objects and three as WC-11 objects. On the basis of these spectra, roughly one-third of the planetaries are identified as having oxygen-rich (silicate) and rather less than one-third carbon-rich (silicon carbide) dust grains. Of the oxygen-rich nebulae, three are VLEs while the rest are very compact and, on various grounds, considered to be young. The remainder of the planetary nebulae exhibit strongly the unidentified feature at 11.25 microns and frequently that at 8.65 microns and their dust chemistry is uncertain. All of the 23 planetaries exhibit one or more of the fine structure forbidden lines of Ar III, S IV and Ne II roughly in accordance with their optical excitation class. The line intensities are consistent with approximately solar abundance of these elements.

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