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Astron. Astrophys. 324, 276-280 (1997)

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A new, evolved bipolar planetary nebula *

Romano L.M. Corradi 1, Eva Villaver 1, Antonio Mampaso 1 and Mario Perinotto 2

1 Instituto de Astrofisica de Canarias, c. Via Lactea S/N, E-38200 La Laguna, Tenerife, Spain
2 Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy

Received 9 December 1996 / Accepted 3 February 1997


Optical imaging and spectroscopy reveal that the ionised region No.252 in the list of Marsalkowa (1974), whose photograph is presented in the "Atlas of Galactic Nebulae" by Neckel & Vehrenberg (1990), is actually a planetary nebula. According to Acker et al. (1992), the object should therefore be named as PN G321.6+02.2. The nebula has the following properties: it is located at 2.0 [FORMULA] 0.5 kpc from the Sun, has a bipolar morphology, a giant size ([FORMULA] 4 pc!), low densities, a hot (unobserved) central star (T [FORMULA] 130000 K), and extreme He and N overabundances (He/H=0.147 [FORMULA] 0.029, log(N/O)=0.47 [FORMULA]). The nebula is likely to be in a very evolved evolutionary stage.

Key words: planetary nebulae: PN G321.6+02.2

* Based on observations made at the European Southern Observatory

Send offprint requests to: R. Corradi (rcorradi@iac.es)

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998