Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7898b&link_type=abstract
HST Proposal ID #7898
Mathematics
Logic
Hst Proposal Id #7898 Interstellar And Intergalactic Media
Scientific paper
We propose a NICMOS snapshot survey of proto-planetary nebulae {PPNe} in order to discern the structure of the nebulae and the evolutionary sequence that produces axially symmetric planetary nebulae {PNe}. This is a follow-up proposal to our very successful Cycle 6 WFPC2 snapshot survey, which we have used to select for further study the best targets for observing with NICMOS and modelling with our axially-symmetric dust code. The proposed NICMOS observations will provide both morphological details of the nebula, and an extension of our imaging to longer wavelengths, complementing both the WFPC2 observations, as well as the high resolution {<0sec point 9} mid-infrared imaging study by Meixner et al. The greater wavelength coverage will allow us to determine the size of the dust grains since the scattering is wavelength- dependent. Making use of the high spatial resolution, we will also detect shocks and look for the small-scale structures that gave rise to the axial symm etry. Finally, we will search for binary companions and, if found, significantly contribute to our knowledge of their role in creating the axial symmetry.
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