Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8210h&link_type=abstract
HST Proposal ID #8210
Physics
Hst Proposal Id #8210 Stellar Ejecta
Scientific paper
Proto-planetary nebulae {PPN} provide the best opportunity to test theories of asymptotic giant branch mass loss {symmetric/asymmetric, continuous/episodic} and the processes which shape planetary nebulae. These remain among the outstanding unsolved problems in stellar evolution. We propose to use WFPC2 to observe several new PPN which display evidence of being bipolar, to study this phenomena. These will be modeled using our newly-developed axially-symmetric, 2-D, dust, radiation-transfer code. We have previously used WFPC2 to image 4 new bipolar PPN, and have successfully modeled their structures and spectral energy distributions. This proposal will extend this study to additional PPN and give important evidence on how common is the bipolar structure. In addition, we have found concentric arcs, seen previously in the Egg Nebula, to exist in 2 additional bipolar PPN. This has important implications for the mass loss mechanism. We will investigate the existance of these arcs in additional bipolar PPN by obtaining deep images.
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