NTT V, I colour-magnitude diagrams of the bulge globular cluster Tonantzintla 2

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 120, Number 1, November_II 1996


Page(s)		153 - 156
DOI		http://dx.doi.org/10.1051/aas:1996281

NTT V, I colour-magnitude diagrams of the bulge globular cluster Tonantzintla 2 DOI: 10.1051/aas:1996281

Astronomy and Astrophysics Supplement Series, Vol. 120, November II 1996, 153-156

NTT V, I colour-magnitude diagrams of the bulge globular cluster Tonantzintla 2

E. Bica , S. Ortolani and B. Barbuy
Send offprint requests to: B. Barbuy

Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre, 91500-970, Brazil
Università di Padova, Dept. di Astronomia, Vicolo dell'Osservatorio 5, I-35123 Padova, Italy
Universidade de São Paulo, IAG, Dept. de Astronomia, CP 9638, São Paulo 01065-970, Brazil

Received March 5; accepted April 9, 1996

Abstract:

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

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