On the Chemical Abundances of Multiple-Shell Planetary Nebulae with Halos
We present narrowband imagery and long-slit intermediate-resolution spectroscopy of the multiple-shell planetary nebulae NGC 2438 and NGC 5882. A comparative study of the chemical abundances of the main nebulae and their surrounding halos shows a moderate N/O enrichment of the central regions. The oxygen abundances appear constant throughout the
Guerrero, M. A. et al.
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1999