Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-17
Astronomy and Astrophysics
Astrophysics
To appear in ``Asymmetrical Planetary Nebulae II: from Origins to Microstructures,'' ASP Conference Series, Vol. 199, 2000; J.
Scientific paper
AGB stars, the precursors of Planetary Nebulae, exhibit high rates of mass loss and eject material in the form of a slow (10-20 km/s), dusty molecular wind. The general belief that the dust component of AGB circumstellar envelopes have smooth density profiles and spherical symmetry have recently been shaken by new high resolution images, showing that clumpy and asymmetric structures, analogous to the ones observed in Planetary Nebulae, can be present even before the end of the AGB. To illustrate how and when these structures appear, and possibly to address the question of how they may shape the subsequent evolution of these systems, we have started a campaign of mid-IR high spatial resolution imaging of a selected sample of AGB targets. We want here to illustrate our technique, developed for the mid-IR camera MIRAC3, and to show the first results obtained at the NASA Infrared Telescope Facility.
Dayal Aditya
Deutsch Lynne K.
Fazio Giacomo
Hoffmann William F.
Hora Joseph L.
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