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Stellar metallicity distributions in local dwarf spheroidal galaxies: a comparison between model and observations

  • Gustavo A. Lanfranchi (a1) and Francesca Matteucci (a2)

Abstract

We analyze the main populations of 6 local Dwarf Spheroidal Galaxies by comparing the observed stellar metallicity distributions with the predictions of chemical evolution models. The predicted metallicity distributions of stars generally exhibit a low range of metallicities, a peak below the one of the MW disc in the solar neighborhood (but similar to the Halo), and a sharp decrease at higher metallicities in agreement with observations. The position of the peak is related to the low star formation rates adopted whereas the sharp decrease is a consequence of the occurrence of strong galactic winds. In the low metallicity tail of the distributions we predict a low number of stars in agreement with observations.

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References

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Keywords

Stellar metallicity distributions in local dwarf spheroidal galaxies: a comparison between model and observations

  • Gustavo A. Lanfranchi (a1) and Francesca Matteucci (a2)

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