The IRAS low-resolution spectra of planetary nebulae

Details The IRAS low-resolution spectra of planetary nebulae The IRAS low-resolution spectra of planetary nebulae

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..485v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 485-510. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

36

Astronomical Catalogs, Infrared Astronomy Satellite, Iue, Planetary Nebulae, Sky Surveys (Astronomy), Asymptotic Giant Branch Stars, Line Spectra, Stellar Evolution, Stellar Spectra, Stellar Winds

Scientific paper

This paper presents the low-resolution spectra of 170 planetary nebulae observed by IRAS, most of which were not included in the Atlas of Low-Resolution Spectra. These have been classified into eight groups based upon the spectral morphology, with emphasis on the dust continuum rather than the spectral lines. The Low-Resolution Spectrometer (LRS) spectra are nearly evenly divided between spectra which show only a dust continuum with no lines, and spectra where there are strong lines with a dust continuum appearing longwards of about 15 microns. A study has been made of the strength of the 11.3-micron PAH emission feature as a function of the nebular C/O ratio, combining ground-based and LRS data. The C/O ratio for IC 2621 is derived from IUE spectra and used in this study. The 11.3-micron feature is present with essentially constant strength in all nebulae with C/O above about 1. Only marginal evidence exists for its presence below C/O about 1 and then at a level about 5 times lower than in carbon-rich nebulae.

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