Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8332b&link_type=abstract
HST Proposal ID #8332
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8332 Stellar Ejecta
Scientific paper
A fuller understanding of the symbiotic star phenomenon is important to several branches of present day astrophysics including mass loss, accretion onto compact objects, and photoionisation and radiative transfer in gaseous nebulae. Optical imaging has been used to great effect in combination with observations at other wavelengths, and the detailed history of variability of sources, to determine such fundamental parameters as distances, likely jet collimation mechanisms and evolutionary links to the formation of planetary nebulae. That said, there is a dearth of high spatial resolution imaging of these objects with the HST. This is despite the fact that our own radio interferometry has shown structure down to sub-arcsecond size scales where in many cases one is sampling regions with dimensions of order that of the central binary pair. Here we propose to conduct the first HST survey of a carefully selected sample of symbiotics covering all major sub-types. As this is an expl or atory programme, requiring relatively short exposures, we have chosen to conduct it in SNAPSHOT mode.
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