The Kinematics of Point-symmetric Planetary Nebulae

Details The Kinematics of Point-symmetric Planetary Nebulae The Kinematics of Point-symmetric Planetary Nebulae

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117..967g&link_type=abstract

The Astronomical Journal, Volume 117, Issue 2, pp. 967-973.

Astronomy and Astrophysics

Astronomy

26

Ism: Kinematics And Dynamics, Planetary Nebulae: Individual (He 1-1, He 2-429, Pc 19, Pe 1-17)

Scientific paper

Four planetary nebulae (PNe) with conspicuous point-symmetric morphology are studied in this paper through high-quality imagery and long-slit echelle spectroscopy. Point symmetry is also found in the velocity space, and this is related to particular forms of bipolar collimated outflows. Morphology and kinematics together reveal the presence of collimated bipolar ejections in an episodic way with indications of rotation or displacement of the symmetry axis of the outflow. Point symmetry is currently known to occur in a wide variety of PNe and the convenience of a reevaluation of point-symmetric PNe as a main morphological class is pointed out.

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