Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10153k&link_type=abstract
HST Proposal ID #10153
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #10153 Ism
Scientific paper
To investigate the cause and nature of classical symbiotic outbursts, we initiated a program of multi-wavelength observations of these events. As evidence is mounting that collimated outflows {jets} may be associated with symbiotic outbursts, we also investigate conditions needed for jet production - a question with broad astrophysical relevance. The first target for our campaign - the 2000-2002 outburst of Z Andromedae - confirmed the utility and need for coordinated multi-wavelength observations to make progress in understanding the nature of the outburst mechanisms in symbiotic stars. FUSE data were the cornerstone of that project {which included data from the VLA, MERLIN, ground-based spectroscopy and photometry, Chandra, and XMM, but not HST}. Our Z And observations have motivated us to propose a new scenario that we term the "combination nova" which is triggered by a disk-instability. To test this new model, we received HST Cycle 12 and FUSE Cycle 4 time {through approximately 6/2004} to continue the multi-wavelength approach with observations at several epochs during the outburst of a second target-of-opportunity {TOO}. That TOO has not yet been triggered. We propose here to continue this TOO observing opportunity into Cycle 13 {to 7/2005}. FUSE Cycle 5 observations {to mid-2005} were recently approved. Coordinated XMM and VLA observations are also approved. The evolution of the UV spectrum throughout the outburst plays a vital role in distinguishing between the outburst models currently in contention for describing outburst behavior. Analysis of our first campaign has shown that HST observations can play a fundamental role in the multi-wavelength approach. The combination of high-resolution STIS and FUSE-band emission and absorption features, time-tagged observations, and continua provide a unique opportunity to probe the structure and ionization conditions in the outburst material that can not be accomplished with either ultraviolet region alone.
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