Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11676m&link_type=abstract
HST Proposal ID #11676. Cycle 17
Other
Scientific paper
At optical wavelengths, the extreme carbon star, AFGL3068, exhibits a remarkable spiral morphology in its dense, outflowing, circumstellar envelope, showing at least 5 windings of its externally illuminated dust shell around the invisible central star. Near-IR imaging with the Keck Telescope shows that this is a binary system with ~100 AU separation, so the spiral structure seen in the circumstellar outflow is apparently caused by the binary interaction. We propose to obtain relatively deep images of this spiral dust structure with the F475W and F606W filters in order to: 1} image more distant windings of the spiral structure, if they are present, and thereby explore the history of the mass loss rate, and 2} refine the details of the spiral density distribution of dust, for comparison with our existing dynamical & radiative transfer models of gas flow within a binary system containing a star undergoing spherical mass loss. With the proposed imaging in two filters, we will also have the color information for comparison with our models of the external illumination of the dusty envelope by Galactic starlight. Comparable dust "arcs" have been observed in a variety of other post-AGB stars, planetary and preplanetary nebulae, but none is as highly organized, as continuous, nor as clearly defined as the dust structure in AFGL3068. By understanding this favorable case, we hope to gain insights into this whole class of objects.;
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