Dipartimento di Astronomia Università di Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: email@example.com
2 INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: firstname.lastname@example.org
Corresponding author: E. Valenti, email@example.com
Accepted: 8 January 2004
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, ) and, once combined with the optical data, in the (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 [CITE] 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
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the Consorzio Nazionale per l'Astronomia e l'Astrofisica (CNAA) at the Spanish Observatory del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
© ESO, 2004