|Dust processing and grain growht in Keplerian discs around binary post-AGB stars.
|We propose to use the Herschel-PACS-SPIRE instruments to study the far-infrared continuum emission of a sample of evolved stars, both in the Galaxy and the Large Magellanic Cloud (LMC). All these stars are proven or suspected binaries surrounded by a long-lived circumbinary disc. Our analysis of the SPITZER mid-infrared spectra of these stars showed that grain processing is very effcient in these discs, despite the very short evolutionary timescale of the post-AGB central star. Extending the spectral energy distribution (SED) to far-infrared wavelengths is an essential complement in constraining the disc characteristics. The long-wavelength flux is very sensitive to the amount of large grains, and thus the total dust mass, and grain-size distribution within the disc. The ultimate goal of our research is to study the structure, formation and evolution of the very common discs around evolved binary stars, and constrain their impact on the evolution of the binary systems.
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2012, OT1_cgielen_2, SPG v14.1.0. https://doi.org/10.5270/esa-zy3hf57