Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923901h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #239.01
Other
Scientific paper
The rapid evolution of stars from the Asymptotic Giant Branch to the planetary nebula phase is often accompanied by powerful, high velocity jets whose origins are not well understood. We compare current theoretical ideas for the production of jets with observations, using a sample of proto-planetary nebulae whose dynamical properties are well-studied in the millimeter lines of CO. In addition to the jets, we find that the mass and energetics of the equatorial mass-loss that typically accompanies the jets are important diagnostics. Our integrated approach provides estimates for some key physical quantities, such as the binding energy of the envelope when the jets are launched, and allows us to investigate model features using correlations between parameters. Even with a relatively small sample, we find that some specific scenarios for powering jets can be ruled out or rendered implausible, and others are promising at a quantitative level.
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