Chemical abundances from planetary nebulae in local spiral galaxies

@article{Richer2015ChemicalAF,
  title={Chemical abundances from planetary nebulae in local spiral galaxies},
  author={Michael G. Richer and Marshall L. McCall},
  journal={Proceedings of the International Astronomical Union},
  year={2015},
  volume={11}
}
  • M. RicherM. McCall
  • Published 1 August 2015
  • Physics
  • Proceedings of the International Astronomical Union
Abstract While the chemical abundances observed in bright planetary nebulae in local spiral galaxies are less varied than their counterparts in dwarfs, they provide new insight. Their helium abundances are typically enriched by less than 50% compared to the primordial abundance. Nitrogen abundances always show some level of secondary enrichment, but the absolute enrichment is not extreme. In particular, type I PNe are rare among the bright PNe in local spirals. The oxygen and neon abundances… 
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