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 citet{F00} and with the theoretical expectations, showing a very good agreement.
VALENTI E., FERRARO F.R., PERINA S., ORIGLIA L. (2004). Near-IR photometry of five Galactic Globular Clusters. ASTRONOMY & ASTROPHYSICS, 419, 139-147 [10.1051/0004-6361:20034402].
Near-IR photometry of five Galactic Globular Clusters
VALENTI, ELENA;FERRARO, FRANCESCO ROSARIO;PERINA, SIBILLA;
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 citet{F00} and with the theoretical expectations, showing a very good agreement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
