A new, evolved bipolar planetary nebula.

Bibcode
1997A&A...324..276C
Corradi, R. L. M.; Villaver, E.; Mampaso, A.; Perinotto, M.
Bibliographical reference

Astronomy and Astrophysics, v.324, p.276-280

Advertised on:
8
1997
Journal
Astronomy and Astrophysics
Number of authors
4
IAC number of authors
1
Citations
26
Refereed citations
20
Description
Optical imaging and spectroscopy reveal that the ionised region No.252 in the list of Marsalkowa (1974Ap&SS..27....3M), whose photograph is presented in the ``Atlas of Galactic Nebulae'' by Neckel & Vehrenberg (1990), is actually a planetary nebula. According to Acker et al. (1992ESOPN...1....1A), the object should therefore be named as PN G321.6+02.2. The nebula has the following properties: it is located at 2.0+/-0.5kpc from the Sun, has a bipolar morphology, a giant size (~4pc!), low densities, a hot (unobserved) central star (T>130000K), and extreme He and N overabundances (He/H=0.147+/-0.029, log(N/O)=0.47^+0.20^_-0.38_). The nebula is likely to be in a very evolved evolutionary stage.
Type
Refereed
Planetary nebulae

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