Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-21
Astronomy and Astrophysics
Astrophysics
To be published in MNRAS, 9 pages, 5 figures
Scientific paper
10.1046/j.1365-8711.2000.03159.x
Narrow-band H$\alpha$ and [N {\sc ii}] images and high-dispersion spatially-resolved echelle spectroscopy of the planetary nebula NGC 6891 are presented. These observations show a great wealth of structures. The bright central nebula is surrounded by an attached shell and a detached outer halo. Both the inner and intermediate shells can be described as ellipsoids with similar major to minor axial ratios, but different spatial orientations. The kinematical ages of the intermediate shell and halo are 4,800 and 28,000 years, respectively. The inter-shell time lapse is in good agreement with the evolutionary inter-pulse time lapse. A highly collimated outflow is observed to protrude from the tips of the major axis of the inner nebula and impact on the outer edge of the intermediate shell. Kinematics and excitation of this outflow provide conclusive evidence that it is deflected during the interaction with the outer edge of the intermediate shell. At the same time, both the kinematics and the morphology of the intermediate shell appear to be affected by this interaction.
Guerrero Martin A.
Manchado Arturo
Miranda Luis F.
Vazquez Ruben
No associations
LandOfFree
The triple-shell structure and collimated outflows of the planetary nebula NGC 6891 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 The triple-shell structure and collimated outflows of the planetary nebula NGC 6891, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The triple-shell structure and collimated outflows of the planetary nebula NGC 6891 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-249590