High Resolution Mid-Infrared Imagings of a Dust Torus around Proto- Planetary Nebulae

Details High Resolution Mid-Infrared Imagings of a Dust Torus around Proto- Planetary Nebulae High Resolution Mid-Infrared Imagings of a Dust Torus around Proto- Planetary Nebulae

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..282u&link_type=abstract

NOAO Proposal ID #2000B-0282

Physics

Scientific paper

We propose to obtain high resolution mid-infrared images of six proto-planetary nebula (PPN) candidates, which are intermediate mass evolved stars between the asymptotic giant branch and planetary nebula phases. In our previous PPN mid-infrared surveys with smaller aperture telescopes, we could only resolve four PPN dust shells due to the physically compact sub-arcsecond scale of the PPN dust shells and the diffraction-limited nature of mid-infrared imaging. Now, with MMT/MIRAC3, we can obtain mid-infrared images with more than a factor of two better angular resolution than in our previous survey. Our proposed observations of PPN dust shells will reveal the toroidal structure of the dust emission cores of the PPN dust shells and will provide key information as to how the mass loss geometry changes from spherical to axial symmetry. In particular, we will use the images to constrain model parameters in our 2-D dust radiative transfer code. The derived quantities such as the pole-to-equator mass loss ratio quantify the axisymmetric characteristics of PPN dust shells and put tighter constraints on theoretical magneto-hydrodynamic models of axisymmetric planetary nebula formation.

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