Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 120, Number 1, November_II 1996
Page(s) 153 - 156
DOI https://doi.org/10.1051/aas:1996281
Published online 15 November 1996
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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