Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-21
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, to appear in "Asymmetrical Planetary Nebulae IV", eds. R. L. M. Corradi, A. Manchado, N. Soker
Scientific paper
We report on a study of the time sequence for the appearance of high-velocity jets and equatorial tori in the transition of stars from the asymptotic giant branch to the planetary nebulae phase. Jets and tori are prominent features of this evolution, but their origins are uncertain. Using the kinematics of molecular tori and molecular or optical jets, we determine the ejection histories for a sample of well-observed cases. We find that jets and tori develop nearly simultaneously. We also find evidence that jets appear slightly later than tori, with a typical jet-lag of a few hundred years. The reconstructed time-lines of this sequence provide good evidence that jets and tori are physically related, and they set new constraints on jet formation scenarios. Some scenarios are ruled out or rendered implausible, and others are challenged at a quantitative level.
No associations
LandOfFree
Jets and Tori in Proto-Planetary Nebulae: Observations vs. Theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Jets and Tori in Proto-Planetary Nebulae: Observations vs. Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Jets and Tori in Proto-Planetary Nebulae: Observations vs. Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-543898