M54 + SAGITTARIUS = ω CENTAURI

@article{Carretta2010M54S,
  title={M54 + SAGITTARIUS = $\omega$ CENTAURI},
  author={Eugenio Carretta and A. Bragaglia and R. G. Gratton and Sara Lucatello and Michele Bellazzini and G. Catanzaro and Francesco Leone and Yazan Momany and Giampaolo Piotto and Valentina D’Orazi},
  journal={The Astrophysical Journal Letters},
  year={2010},
  volume={714},
  pages={L7 - L11}
}
We derive homogeneous abundances of Fe, O, Na, and α-elements from high-resolution FLAMES spectra for 76 red giant stars in NGC 6715 (M54) and for 25 red giants in the surrounding nucleus of the Sagittarius (Sgr) dwarf galaxy. Our main findings are the following. (1) We confirm that M54 shows intrinsic metallicity dispersion, ∼0.19 dex rms. (2) When the stars of the Sgr nucleus are included, the metallicity distribution strongly resembles that in ω Cen; the relative contribution of the most… 

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