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Astron. Astrophys. 327, 598-601 (1997)

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Research Note

Binary stars in globular clusters: detection of a binary sequence in NGC 2808? *

F.R. Ferraro 1, E. Carretta 1, F. Fusi Pecci 1, 2 and A. Zamboni 1

1 Osservatorio Astronomico di Bologna, Via Zamboni 33, I-40126 Bologna, Italy
2 Stazione Astronomica di Cagliari, I-09012 Capoterra, Italy

Received 16 October 1996 / Accepted 26 June 1997


A CCD V, [FORMULA] colour-magnitude diagram (CMD) of the Galactic globular cluster NGC 2808 has been obtained with the ESO-NTT, reaching down to [FORMULA].

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.

Key words: cluster: globular: NGC 2808 – HR diagram – Techniques: photometry, stars: Population II – binaries: general

* Based on observations obtained at the European Southern Observatory, La Silla, Chile

Send offprint requests to: ferraro@astbo3.bo.astro.it

SIMBAD Objects


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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998