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- W1973137029 abstract "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." @default.
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- W1973137029 date "1981-12-01" @default.
- W1973137029 modified "2023-09-26" @default.
- W1973137029 title "Ionization structure and partial obscuration of the planetary nebulae NGC 3132 and NGC 3242" @default.
- W1973137029 doi "https://doi.org/10.1086/130909" @default.
- W1973137029 hasPublicationYear "1981" @default.
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