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Astron. Astrophys. 326, 1187-1194 (1997)

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Morphology and expansion characteristics of the planetary nebula M1-79

W. Saurer *

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

Received 31 January 1997 / Accepted 22 April 1997

Abstract

In this paper we present deep broad- and narrow-band images (Johnson B, Gunn-red, H [FORMULA], H [FORMULA] +[NII], [NII], [OIII]) and high resolution spectroscopy (Fabry-Pérot interferometer (H [FORMULA], H [FORMULA], [NII], [OIII]) and Coudé measurements (H [FORMULA], [NII])) for the planetary nebula (PN) M1-79. Systemic and expansion velocities are investigated along with the morphological characteristics of this PN. M1-79 exhibits an elliptical central region surrounded by a bipolar structure (lobes) which is probably much more extended than previously known. Various symmetry axes of the projected shape of this PN are discussed with respect to a three dimensional model. Two axes cannot be explained by projection effects. They give evidences for ejections along different axes during the formation process of this PN. A possible scenario of the evolutionary process of M1-79 is discussed.

Key words: planetary nebulae: individual: M1-79; general

* 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: April 8, 1998
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