Physics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop50092g&link_type=abstract
Spitzer Proposal ID #50092
Physics
Scientific paper
Dust processing is one of the key factors in the formation of macrostructures in the circumstellar environment (CS) of stars. The most natural environment to study dust processing and its effect on the properties of the CS physics are the discs around young stellar objects. In recent years however, it became clear that dust processing is also extremely efficient in circumbinary discs around evolved objects. We have shown that these discs are common, and likely exclusively found around evolved binaries. Using IR-interferometry we have shown that the discs are very compact and remarkably stable: they must play a lead role in the evolution of the systems. Our pilot program with Spitzer showed that dust grains can be extremely processed indeed. With this follow-up program we aim to use IRS for a well selected and representative sample, both in the Galaxy and in the LMC, to investigate not only the dust characteristics of the individual objects, but also to study the evolution of the dust around these rapidly evolving objects. The program is embedded in an extensive multi-wavelength program to investigate the evolutionary processes which govern the circumstellar physics of evolved binaries as well as the impact of the stable disc on the final evolution of binary stars.
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