Zinc abundances of planetary nebulae

@article{Smith2014ZincAO,
  title={Zinc abundances of planetary nebulae},
  author={Christina L. Smith and Albert A. Zijlstra and Harriet L. Dinerstein},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={441},
  pages={3161-3169}
}
Zinc is a useful surrogate element for measuring Fe/H as, unlike iron, it is not depleted in the gas phase media. Zn/H and O/Zn ratios have been derived using the [Zn IV] emission line at 3.625um for a sample of nine Galactic planetary nebulae, seven of which are based upon new observations using the VLT. Based on photoionization models, O/O++ is the most reliable ionisation correction factor for zinc that can readily be determined from optical emission lines, with an estimated accuracy of 10… 

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