most citedChemical abundances for Hf 2-2, a planetary nebula with the strongest known heavy element recombination lines

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astro-ph2006★ 98 cited

Chemical abundances for Hf 2-2, a planetary nebula with the strongest known heavy element recombination lines

X. -W. Liu, M. J. Barlow, Y. Zhang +2

We present high quality optical spectroscopic observations of the planetary nebula (PN) Hf 2-2. The spectrum exhibits many prominent optical recombination lines (ORLs) from heavy e…