# The subgiant branch of ω Centauri seen through high-resolution spectroscopy. I. The first stellar generation in ω Cen?

@article{Pancino2011TheSB,
title={The subgiant branch of $\omega$ Centauri seen through high-resolution spectroscopy. I. The first stellar generation in $\omega$ Cen?},
author={E. Pancino and A. Mucciarelli and L. Sbordone and M. Bellazzini and L. Pasquini and L. Monaco and F. Ferraro},
journal={Astronomy and Astrophysics},
year={2011},
volume={527},
pages={1-15}
}
We analysed high-resolution UVES spectra of six stars belonging to the subgiant branch of ω Centauri, and derived abundance ratios of 19 chemical elements (namely Al, Ba, C, Ca, Co, Cr, Cu, Fe, La, Mg, Mn, N, Na, Ni, Sc, Si, Sr, Ti, and Y). A comparison with previous abundance determinations for red giants provided remarkable agreement and allowed us to identify the sub-populations to which our targets belong. We found that three targets belong to a low-metallicity population at [Fe/H] � –2.0… Expand
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