The M33 Metallicity Project: Resolving the Abundance Gradient Discrepancies in M33

@article{Rosolowsky2008TheMM,
  title={The M33 Metallicity Project: Resolving the Abundance Gradient Discrepancies in M33},
  author={Erik W. Rosolowsky and Joshua D. Simon},
  journal={The Astrophysical Journal},
  year={2008},
  volume={675},
  pages={1213 - 1222}
}
We present a new determination of the metallicity gradient in M33, based on Keck LRIS measurements of oxygen abundances using the temperature-sensitive emission line [O III] λ4363 in 61 H II regions. These data approximately triple the sample of direct oxygen abundances in M33. We find a central abundance of 12 + log (O/H) = 8.36 ± 0.04 and a slope of –0.027 ± 0.012 dex kpc−1, in agreement with infrared measurements of the neon abundance gradient but much shallower than most previous oxygen… 

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