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Searching For Chemical Signatures Of Multiple Stellar Populations In The Old, Massive Open Cluster NGC 6791

Bragaglia, Angela; Sneden, Christopher; Carretta, Eugenio; Gratton, Raffaele G.; Lucatello, Sara; Bernath, Peter F.; Brooke, James S. A.; Ram, Ram S. (2014-11)

Galactic open and globular clusters (OCs, GCs) appear to inhabit separate regions of the age-mass plane. However, the transition between them is not easily defined because there is some overlap between high-mass, old OCs ...

X-Shooter Observations of Main-Sequence Stars in the Globular Cluster NGC 2808: First Chemical Tagging of A He-Normal and A He-Rich Dwarf

Bragaglia, A.; Carretta, E.; Gratton, R. G.; Lucatello, Sara; Milone, A.; Piotto, G.; D'Orazi, V.; Cassisi, S.; Sneden, Christopher; Bedin, L. R. (2010-09)

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 ...