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Astron. Astrophys. Suppl. Ser.
Volume 138, Number 2, August 1999
Page(s) 275 - 297
Published online 15 August 1999
DOI: 10.1051/aas:1999107

Astron. Astrophys. Suppl. Ser. 138, 275-297

Monochromatic morphologies of Abell planetary nebulae[*]

C.T. Hua1 - S. Kwok2

Send offprint request: C.T. Hua

1 - Laboratoire d'Astronomie Spatiale du CNRS, Allée Peiresc, Les Trois Lucs, BP. 8, 13376 Marseille Cedex 12, France
2 - Department of Physics & Astronomy, University of Calgary, Calgary, T2N 1N4, Canada

Received February 26; accepted June 4, 1999


Monochromatic ($\Delta \lambda \leq$ 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 H$\alpha$, [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)

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