Planetary Nebula Abundances and Morphology: Probing the Chemical Evolution of the Milky Way
نویسندگان
چکیده
This paper presents a homogeneous study of abundances in a sample of 79 northern galactic planetary nebulae whose morphological classes have been uniformly determined. Ionic abundances and plasma diagnostics were derived from selected optical line strengths in the literature, and elemental abundances were
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