Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..79..229l&link_type=abstract
Astrophysics and Space Science, vol. 79, no. 1, Sept. 1981, p. 229-237.
Astronomy and Astrophysics
Astrophysics
7
Planetary Nebulae, Ring Structures, Stellar Envelopes, Stellar Models, Stellar Spectrophotometry, Astronomical Photography, Brightness, H Alpha Line, Oxygen Ions, Oxygen Spectra, Spherical Shells
Scientific paper
The structure of the double-ring planetary nebula NGC 2392 (the Eskimo Nebula) is investigated. Monochromatic photographs of the nebula obtained with narrowband interference filters centerd on the H-alpha, forbidden N II 6584 A and forbidden O III 5007 A emission lines reveal the structures in H alpha and the forbidden N II line to be quite similar, with an elliptical inner ring and a broken outer ring, while both rings in forbidden O III are observed to be circular and regular in brightness. A photometric study provides maximum ring intensity/ring center intensity ratios too high to be consistent with the nature of the inner ring as a uniform spherical shell. The spectroscopic and photometric observations are explained in terms of a model consisting of an inner toroid surrounded by a spherical shell.
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