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Deep monochromatic observations are pre- sented for 22 galactic planetary nebulae (PNe) performed through narrow-band interference lters, in the direct imaging mode with i) the New Zealand (MJUO) f/7.8 Mc- Lellan telescope, ii) the Observatoire de Haute Provence (OHP) f/6 120-cm telescope, and iii) and the Siding Spring Observatory (SSO) ATT 2.3 metre telescope. Some of them are observed for the rst time. Conspicuous sec- ondary structures are detected far around the conventional nebular pictures. Such features could be relics of early mass ejections during the post-AGB phase of the progeni- tors. Alternatively, they are more plausibly projections of external loops/bubbles of the \bar-bell" shape upon the waist (for face-on PNe). We suggest that such structures (cf. Sh 1-89, Hua 1997) are intrinsic to all PNe. Their ap- parently diverse morphologies would \simply" result from projections of a same PN intrinsic structure at dierent view angles onto the plane of sky and with respect to the major axis as well. In addition we report the detection of a new nebula in the eld of NGC 3699 (50 00 distant).

Detection of new emission structures around planetary nebulae