The dust content of two carbon-rich planetary nebulae

Details The dust content of two carbon-rich planetary nebulae The dust content of two carbon-rich planetary nebulae

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..193h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 15, 1990, p. 193-206. Research supported by SE

Astronomy and Astrophysics

Astronomy

37

Carbon, Cosmic Dust, Interstellar Matter, Planetary Nebulae, Astronomical Models, Emission Spectra, Infrared Spectra, Interstellar Gas, Photoionization, Temperature Distribution

Scientific paper

Detailed models of the gas and dust emission are presented for two carbon-rich planetary nebulae. Dust-to-gas mass ratios 0.0006 and 0.0003 are derived for IC 418 and NGC 7662, respectively. Models using graphite and amorphous carbon grains were tried, neither providing a totally satisfactory fit. Silicon carbide was also included in the IC 418 models and a dust-to-gas ratio of 0.00006 was deduced for this component. The effects on these conclusions of dust in a neutral region and giant halo surrounding IC 418 and NGC 7662, respectively, were found to be fairly negligible.

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