Astron. Astrophys. Suppl. Ser.
Volume 120, Number 1, November II 1996
|Page(s)||153 - 156|
|Published online||15 November 1996|
NTT V, I colour-magnitude diagrams of the bulge globular cluster Tonantzintla 2*
Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre, 91500-970, Brazil
2 Università di Padova, Dept. di Astronomia, Vicolo dell'Osservatorio 5, I-35123 Padova, Italy
3 Universidade de São Paulo, IAG, Dept. de Astronomia, CP 9638, São Paulo 01065-970, Brazil
Send offprint request to: B. Barbuy
Accepted: 9 April 1996
Ton 2 is among the less-known Galactic globular clusters. We present for the first time colour magnitude diagrams in the V, I bands. We used the ESO NTT telescope under an excellent seeing of 0.6″. The horizontal branch is red and close to the red giant branch, tilted by some differential reddening. The horizontal branch morphology and the red giant branch curvature suggest a metallicity similar to that of 47 Tucanae. We derive a reddening of = 1.26 and a distance = 6.4 kpc. Therefore, Ton 2 is ≈ 2.0 kpc from the Galactic center, and it appears to belong to the bulge population, being however only moderately metal rich.
Key words: globular clusters: Ton 2 / HR diagram
© European Southern Observatory (ESO), 1996