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Recombination-line Abundances for the Third-Row Element, Magnesium
Symposium - International astronomical union
We have obtained optical recombination-line abundances for the third-row element magnesium in ten planetary nebulae. The nebulae in our sample include four (NGC 7009, NGC 6153, M 2–36 and M 1–42) for which we have previously found very large enhancements, relative to solar, in the recombination line abundances of the second-row elements carbon, nitrogen, oxygen and neon (Liu et al. 1995, Liu et al. 2000, Liu et al. 2001). Nebular temperature fluctuations appear unable to account for thesedoi:10.1017/s0074180900209054 fatcat:h4s4r7ko4bhtfng57xxq4srdy4