Monochromatic morphologies of Abell planetary nebulae *
Laboratoire d'Astronomie Spatiale du CNRS, Allée Peiresc, Les Trois Lucs, BP. 8, 13376 Marseille Cedex 12, France e-mail: firstname.lastname@example.org
2 Department of Physics & Astronomy, University of Calgary, Calgary, T2N 1N4, Canada e-mail: email@example.com
Send offprint request to: C.T. Hua
Accepted: 4 June 1999
Monochromatic ( 10 Å) images have been obtained for seven large (2-10 arcmin) Abell planetary nebulae. From this deep survey, we found 4 to have normal bipolar shapes, whereas 3 have truly spherical shells. The structures of these nebulae are discussed using the absolutely calibrated intensity maps in Hα, N ii , and O iii . An attempt to derive ionized mass using our (dereddened) measured absolute flux as a function of distance to the PN is also given.
Key words: ISM: Planetary nebulae: individual (A 13, A 21, A 24, A 28, A 30, A 33, A 36)
© European Southern Observatory (ESO), 1999