Physics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..199u&link_type=abstract
NOAO Proposal ID #2000A-0199
Physics
Scientific paper
We propose to obtain high resolution mid-infrared images of five proto-planetary nebula candidates (PPN) and to gain spatially resolved information on the structure of the dust emission cores in the innermost regions of the PPN dust shells. Due to small physical scale of PPN dust shells and diffraction-limited nature of mid-infrared imaging, we have spatially resolved a dust torus only in two PPNe. Now, with MMT using MIRAC3, we can obtain mid-infrared images with more than a factor of two better angular resolution then in the previous survey and we will be able to resolve more PPN dust emission cores. Such spatially superior data of PPN dust shells will be valuable because mid-infrared imaging is the most direct method to map out the circumstellar dust shells around PPNe, in which axisymmetry is believed to emerge for the later development of asphericities in planetary nebulae. Because PPN dust shells have not been exposed to disturbing fast winds and ionizing UV photons they retain the mass loss histories in their pristine forms. Therefore, high angular resolution characterization of dust distribution around PPNe will provide valuable insights for yet unknown mechanisms of stellar mass loss.
Dayal Aditya
Deutsch Lynne K.
Fazio Giovanni G.
Hinz Phillip
Hoffmann William F.
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