Bragaglia, Angela; Carretta, Eugenio; Gratton, Raffaele G.; Lucatello, Sara; Milone, Antonino; Piotto, G; D'Orazi, Valentina; Cassisi, S; Sneden, Chris; Bedin, L R
We present the first chemical composition study of two unevolved stars in the globular cluster NGC 2808, obtained with the X-shooter spectrograph at VLT. NGC 2808 shows three discrete, well-separated main sequences. The most accepted explanation for this
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