Chemical abundances and masses of the haloes around the planetary nebulae NGC 6543 and NGC 6826
Spatial resolved low resolution spectroscopy of the haloes around the planetary nebulae NGC 6543 and NGC 6826 were conducted. The results imply that the radiation is thermal and not due to dust reflection. From those data chemical abundances and masses were calculated. Chemical abundances decrease in the haloes, while masses increase up to ten
Manchado, A. et al.
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1989