Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.114..357p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 114, no. 2, Sept. 1985, p. 357-364. In French.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Photography, Morphology, Planetary Nebulae, Astronomical Models, H Alpha Line, Ionic Diffusion, Magnetic Fields, Nitrogen
Scientific paper
Long-exposure plates have been made on NGC 650-1 by Louise (1982). One of the typical features is the filamentary structure which appears sharper in forbidden line of N II than in H-alpha. This author suggests that the H-alpha image is fuzzy because the hydrogen ions diffuse more rapidly than nitrogen ions. It is shown, however, that the relative diffusion of various ions is negligible in planetary nebulae. Therefore, Louise's suggestions must be rejected. The observations of this author can be interpreted by means of an ionization effect, nitrogen being present in N(++) state within the most internal part of filamentary arches. On the other hand, observations made by Sabbadin and Hamzoglu (1981) suggest that NGC 650-1 does not possess axial symmetry. It is shown that two physical mechanisms are necessary to explain it: rotation of nucleus which has ejected the planetary nebulae, and intranebular magnetic field; the magnetic axis being not parallel to the rotation axis.
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