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Ultraviolet Spectrum and Probable Chemical Composition of the High-Excitation Planetary Nebula M1-1

Feibelman, Walter A.; Aller, Lawrence H.; Keyes, Charles D.

One of the highest excitation planetary nebulae known, M1-1, was studied with the image-tube scanner on the Shane 3-m telescope at Lick Observatory and with the International Ultraviolet Explorer. Large fractions of abundant elements such as C, N, O, S, and Ar exist in unobservable stages of ionization. Hence, it is difficult to establish the chem…