Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9208h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #92.08; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the time sequence for the appearance of high velocity jets and equatorial tori during the transition of stars from the Asymptotic Giant Branch to the proto-planetary nebula (PN) phase. The tori represent the sudden, final ejection of the stellar envelope, and the jets are common features of proto-PNe and young PNe, but their origin is uncertain. Based on the expansion times of well observed examples, we find that jets and tori develop in a characteristic sequence. They are nearly simultaneous which provides evidence that they are physically related but the jets tend to appear after the onset of the intense equatorial mass loss, with a time delay (jet-lag) of up to 1,000 yr. We discuss the implications of this sequence for models of jet formation. For models where binary accretion plays a role, the jet-lag sets limits on the disk accretion time and the parameters of the disk.
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