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Astron. Astrophys. 327, 598-601


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Research Note

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

F.R. Ferraro1, E. Carretta1, F. Fusi Pecci1,2, and A. Zamboni1

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

Received 16 October 1996 / Accepted 26 June 1997

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 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


© European Southern Observatory (ESO) 1997

Online publication: October 14, 1997
Last change: April 6, 1998
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