Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..397h&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. 397-400. In French.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Photography, Interferometry, Monochromatic Radiation, Planetary Nebulae, Bandpass Filters, Forbidden Bands, H Alpha Line
Scientific paper
Narrowband photographic and interferometric observations of the structure of the Dumbbell planetary nebula (NGC 6853) are presented. The nebula was photographed with 10-A bandpass interference filters in the H-alpha, forbidden N II 6584 A and forbidden O III 5007 A lines, and compared with interferograms obtained in the same lines. The observations in H-alpha reveal the diffuse nature of H(plus) emission in the nebula, with several filaments visible at the outside edges. The forbidden N II images reveal a complex ensemble of condensations and filaments, with interferograms indicating N(plus) to be concentrated in the expanding envelope of the nebula. Comparison of the H-alpha and forbidden N II images on the basis of photometric and dynamic criteria reveals the forbidden N II lines to be enhanced relative to H-alpha in the outer parts of the nebula. Observations in the forbidden O III line support the cylindrical model proposed by Goudis et al.(1978). The structure of the Dumbbell nebula can thus be interpreted in terms of a cylindrical envelope filled with matter which would appear as a ring nebula if seen edge on.
Hua Chon-Trung
Louise R.
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