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Issue A&A Volume 419, Number 1, May III 2004 Page(s) 139 - 147 Section Galactic structure, stellar clusters and populations DOI 10.1051/0004-6361:20034402

A&A 419, 139-147 (2004)
DOI: 10.1051/0004-6361:20034402

Near-IR photometry of five Galactic Globular Clusters

E. Valenti^{1, 2}, F. R. Ferraro¹, S. Perina¹ and L. Origlia<sup>2

1</sup>  Dipartimento di Astronomia Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: ferraro@bo.astro.it
²  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: origlia@bo.astro.it

(Received 25 September 2003 / Accepted 8 January 2004 )

Abstract
We present near-infrared J and K observations of giant stars in five metal-poor Galactic Globular Clusters (namely M 3, M 5, M 10, M 13 and M 92) obtained at the Telescopio Nazionale Galileo (TNG). This database has been used to determine the main photometric properties of the red giant branch (RGB) from the ( K,  J-K) and, once combined with the optical data, in the ( K,  V-K) Color Magnitude Diagrams. A set of photometric indices (the RGB colors at fixed magnitudes) and the major RGB evolutionary features (slope, bump, tip) have been measured. The results have been compared with the relations obtained by Ferraro et al. (2000) and with the theoretical expectations, showing a very good agreement.

Key words: stars: evolution -- Galaxy: globular clusters: individual: M 3, M 5, M 10, M 13, M 92

Offprint request: E. Valenti, elena.valenti2@studio.unibo.it

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