MORPHOLOGY AND EXPANSION CHARACTERISTICS OF THE PLANETARY-NEBULA M1-79

In this paper we present deep broad-and narrow-band images (Johnson B, Gunn-red, H alpha, H alpha+[NII], [NII], [OII]) and high resolution s pectroscopy (Fabry-Perot interferometer (H alpha, H beta, [NII], [OIII ]) and Coude measurements (H alpha, [NII])) for the planetary nebula ( PN) M1-79. Systemic and expansion velocities are investigated along wi th the morphological characteristics of this PN. M1-79 exhibits an ell iptical central region surrounded by a bipolar structure (lobes) which is probably much more extended than previously known. Various symmetr y 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 durin g the formation process of this PN. A possible scenario of the evoluti onary process of M1-79 is discussed.