Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2484g&link_type=abstract
ATNF proposal C2111, Semester: July, 2009
Physics
Stellar, Galactic, Atca
Scientific paper
Water fountains are AGB and post-AGB stars that show the earliest known manifestation of collimated mass-loss in evolved stars. Jets in these sources have dynamical ages of 5-100 yr and sizes 100-500 AU. Therefore, they are key objects to study the shaping of planetary nebulae. Only 11 ``water fountains'' are known to date. Since their thick envelopes make them strongly obscured in the optical and near-IR, their inner circumstellar structure would be best traced at mm and submm wavelengths. We recently observed 8 water fountains with the IRAM 30m telescope, and detected 1mm emission in all of them. Here we propose to make 3mm continuum observations in 10 water fountains, in order to continue building the spectral energy distribution (SED) of these sources at long wavelengths. The theoretical modelling of the resulting SEDs will allow us to estimate the physical parameters of circumstellar disks and envelopes, which in their turn may impose constraints on the proposed models for the generation of jets in evolved objects.
Gomez Jose F.
Miranda Luis F.
Osorio Mayra
Rizzo Ricardo
Suárez Olga
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