Ionization structure and partial obscuration of the planetary nebulae NGC 3132 and NGC 3242

Details Ionization structure and partial obscuration of the planetary nebulae NGC 3132 and NGC 3242 Ionization structure and partial obscuration of the planetary nebulae NGC 3132 and NGC 3242

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..695c&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Dec. 1981, p. 695-702. Research supported by the Natural Sciences an

Astronomy and Astrophysics

Astronomy

9

Brightness Distribution, Emission Spectra, Image Processing, Ion Distribution, Monochromatic Radiation, Planetary Nebulae, Balmer Series, Charge Coupled Devices, Data Reduction, Forbidden Bands, H Alpha Line, Ion Density (Concentration)

Scientific paper

Monochromatic images are presented of a low-excitation planetary nebula, NGC 3132, and of a high-excitation, double-shell nebula, NGC 3242 in the light of H-alpha, H-beta, forbidden N II 6584, and forbidden S III 9232. For both nebulae, the forbidden N II radiation had a very different surface brightness distribution from that of the forbidden S III and the hydrogen. In NGC 3132, the forbidden N II emission was concentrated in a narrow outer annulus, whereas in NGC 3242, it was concentrated in the central region. The forbidden N II emission appears to originate in dense concentrations within the inner shell, and the outer shell, almost spherical in shape, seems to be density bounded. The forbidden N II/H map in both cases shows significant structural features not seen in the individual intensity maps. Reddening, determined from the H-alpha/H-beta ratio, appears to be due to dust which is external to NGC 3132, but which is found in part within NGC 3242.

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