Detection of new emission structures around planetary nebulae

Deep monochromatic observations are presented for 22 galactic planetary neb ulae (PNe) performed through narrow-band interference filters, in the direc t imaging mode with i) the New Zealand (MJUO) f/7.8 McLellan telescope, ii) the Observatoire de Haute Provence (OHP) f/6 120-cm telescope, and iii) an d the Siding Spring Observatory (SSO) ATT 2.3 metre telescope. Some of them are observed for the first time. Conspicuous secondary structures are dete cted far around the conventional nebular pictures. Such features could be r elies of early mass ejections during the post-AGB phase of the progenitors. Alternatively, they are more plausibly projections of external loops/bubbl es of the "bar-bell" shape upon the waist (for face-on PNe). We suggest tha t such structures (cf. Sh 1-89, Hua 1997) are intrinsic to all PNe. Their a pparently diverse morphologies would "simply" result from projections of a same PN intrinsic structure at different view angles onto the plane of sky and with respect to the major axis as well. In addition we report the detec tion of a new nebula in the field of NGC 3699 (50 " distant). Absolute flux es are provided for three emission lines.