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Astron. Astrophys. 324, 651-655 (1997)

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Case studies for planetary nebulae with tilted axes

W. Saurer *

Institut für Astronomie, Leopold-Franzens-Universität, Innsbruck Technikerstr. 25, A-6020 Innsbruck, Austria

Received 23 October 1996 / Accepted 2 December 1996


In this paper we discuss the morphology of two elliptical, point-symmetric planetary nebulae (PNe) with tilted axes: M1-79 and Wei 1-5. By means of simple geometry and the assumption of optical thinness in [OIII] we were able to reproduce the observational (morphological) data on these two objects. We have constructed three-dimensional models consisting of an inner and an outer ellipsoid which can account for the overall shape, the tilt of the axes, and the intensity distribution of the PNe when looked at a certain viewing angle. Our results can be interpreted as an indication for a non-circular component of the density distribution within the equatorial plane.

Key words: planetary nebulae: general – planetary nebulae: individual: M1-79, Wei 1-5

* Visiting Astronomer at the Centro Astronomico Hispano-Aleman, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy.

Send offprint requests to: Walter.Saurer@uibk.ac.at

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998