Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..234m&link_type=abstract
Astronomy and Astrophysics, v.313, p.234-242
Astronomy and Astrophysics
Astrophysics
8
Ism: Dust, Planetary Nebulae: Individual: Ic 418, Stars: Mass-Loss, Infrared: Ism: Lines And Bands
Scientific paper
We present three new images of the young, carbon rich planetary nebula, IC 418: 11.3μm dust emission, a [Ne II]12.8μm line emission and 6cm free-free continuum. All three images show different morphologies. In order to investigate these spatial differences and the mechanisms of dust emission in IC 418, we compare our data to two radiative transfer models with different radial density distributions. Model 1 has a thin shell that drops off as r^-3^, resulting in a high density ionized region surrounded by an ionized halo. While, model 2 has a thicker shell that drops off as r^-2^ resulting in the ionization front stopping in the thick shell and a high density ionized region immediately surrounded by a neutral shell. Both models use a mixture of silicon carbide (SiC) and amorphous carbon (AC) dust grains with dust to gas ratios of ~2x10^-5^ and ~6x10^-4^, respectively and the standard power law distribution in sizes (a^-3.5^; 0.005μm
Arens John F.
Hoare Melvin G.
Jernigan Garret J.
Keto Eric
Meixner Matthew
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