Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8330b&link_type=abstract
HST Proposal ID #8330
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #8330 Stellar Ejecta
Scientific paper
A fuller understanding of the symbiotic star phenomenon is important to several branches of astrophysics including mass loss, accretion onto compact objects, and photoionisation and radiative transfer in gaseous nebulae. Our work with MERLIN, the VLA and the AT has revealed complex structure down to sub- arcsecond spatial scales, similar to the proposed binary separation in some objects. Combining the surprisingly limited amount of HST imaging data that currently exists with our radio observations has demonstrated the potentially important gains in understanding to be made. The aims of this proposal are {i} to help define the positions of the binary components in our targets {crucial to deeper understanding of the sources}; {ii} to relate structure on various spatial scales to the history of activity and other parameters of each source {e.g. to explore collimation mechanisms for jets and to determine distances by expansion parallax}; {iii} to explore physical conditions in t he inner nebulae and perform extinction mapping; {iv} compare and contrast the properties of sub-classes of symbiotic, and {v} to prepare the ground for future STIS spectroscopy. Our target list contains the four objects for which we have the largest amount of ground-based data, and for which structure on sub-arcsecond scales has been revealed by our radio observations. Between them, they represent intriguing examples of both major sub-classes of symbiotic.
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