Morphology and expansion characteristics of the planetary nebula M1-79
Received 31 January 1997 / Accepted 22 April 1997
In this paper we present deep broad- and narrow-band images (Johnson B, Gunn-red, H , H +[NII], [NII], [OIII]) and high resolution spectroscopy (Fabry-Pérot interferometer (H , H , [NII], [OIII]) and Coudé measurements (H , [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
Send offprint requests to: Walter.Saurer@uibk.ac.at
© European Southern Observatory (ESO) 1997
Online publication: April 8, 1998