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A rotating jet in the quadrupolar Planetary Nebula NGC 6881

Published online by Cambridge University Press:  25 May 2016

M. A. Guerrero  and
A. Manchado
M. A. Guerrero
Affiliation:
Instituto de Astrofísica de Canarias
A. Manchado
Affiliation:
Instituto de Astrofísica de Canarias

Extract

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There is a renewed interest in the study of the possible precession of the central sources of planetary nebulae. Three different morphological features are considered the effect of precession:

  1. 1. Point-symmetric PNe: Objects whose morphological components are symmetrical with respect to reflection through the center.

  2. 2. Quadrupolar PNe: Characterized by two well-defined pairs of lobes which are symmetric, in pairs, with respect to two different axes. These PNe are very likely the result of two episodic nebular ejection processes, produced at different positions of the symmetry axis.

  3. 3. Bipolar, rotating episodic jets (or BRET's): Spectacular structures (Lopez, Meaburn, & Palmer 1994) due to the precession of a symmetrical, collimated episodic outflow.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 232 - 233
Copyright
Copyright © Kluwer 1997 

References

Guerrero, M. A., & Manchado, A. 1996, submitted to Astrophys. Journal Letters.Google Scholar
López, J. A., Meaburn, J., & Palmer, J. 1994, Astrophys. Journal Letters, 415, L135.Google Scholar
Manchado, A., Stanghellini, L., & Guerrero, M. A. 1996, Astrophys. Journal Letters, 466, 95.CrossRefGoogle Scholar