A new, evolved bipolar planetary nebula.

Details A new, evolved bipolar planetary nebula. A new, evolved bipolar planetary nebula.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324..276c&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

16

Planetary Nebulae: Individual: Pn G321.6+02.2

Scientific paper

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.

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