Binary stars in globular clusters: detection of a binary sequence in NGC 2808?
F. R. Ferraro, E. Carretta, F. Fusi Pecci, A. Zamboni
Abstract
A CCD V,V-I colour-magnitude diagram (CMD) of the Galactic globular cluster NGC 2808 has been obtained with the ESO-NTT, reaching down to V ~ 24. The highly populated Main Sequence (MS) presents a significant broadening redward to the MS ridge line, larger than expected from photometric errors alone, which could be interpreted as due to binary candidates.
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