Chemical composition of stellar populations in Omega Centauri

Details Chemical composition of stellar populations in Omega Centauri Chemical composition of stellar populations in Omega Centauri

2010-01-10

arxiv.org/abs/1001.1500v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages, 2 figures. To appear in the proceedings of IAU Symp. 268 "Light elements in the Universe" (C. Charbonnel, M. Tosi, F.

Scientific paper

We derive abundances of Fe, Na, O, and s-elements from GIRAFFE@VLT spectra for more than 200 red giant stars in the Milky Way satellite Omega Centauri. Our preliminary results are that: (i) we confirm that Omega Centauri exibiths large star-to-star metallicity variations ($\sim$ 1.4 dex); (ii) the metallicity distribution reveals the presence of at least five stellar populations with different [Fe/H]; (iii) a clear Na-O anticorrelation is clearly observed for the metal-poor and metal-intermediate populations while apparently the anticorrelation disappears for the most metal-rich populations. Interestingly the Na level grows with iron.

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