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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

Abstract

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

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