IRAS spectroscopic observations of young planetary nebulae

Details IRAS spectroscopic observations of young planetary nebulae IRAS spectroscopic observations of young planetary nebulae

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..479z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 2, Oct. 1990, p. 479-494. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

26

Infrared Astronomy Satellite, Planetary Nebulae, Stellar Spectrophotometry, Astronomical Models, Asymptotic Giant Branch Stars, Emission Spectra, Spectral Energy Distribution, Stellar Envelopes

Scientific paper

The 18-micron silicate dust feature is detected in 11 young PNe selected from radio properties. The presence of the 18-micron feature suggests that oxygen-rich PNe are more common than previously believed. The silicate dust probably originates from the remnants of the circumstellar envelopes of the AGB progenitors and remains visible in young PNe. Most interestingly, there are six young PNe that show both oxygen- and carbon-rich dust features. It is possible that a PN that descends from an oxygen-rich progenitor star will be classified as carbon-rich as the silicate feature diminishes and the UV-excited PAH bands become more important as the PN ages.

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