Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..136..363b&link_type=abstract
Astronomy and Astrophysics Supplement, v.136, p.363-372
Astronomy and Astrophysics
Astrophysics
11
Globular Clusters: Eso 452-Sc11, Open Clusters: Eso 93-Sc08, Hr Diagram
Scientific paper
We present V and I colour-magnitude diagrams of the star clusters ESO 93-SC08 and ESO 452-SC11. Both clusters are poorly populated, and the colour-magnitude diagrams show that ESO 93-SC08 is an intermediate age open cluster, while ESO 452-SC11 is confirmed as a globular cluster. The magnitude difference between the turnoff and the clump/horizontal branch indicates an age of 4 - 5 Gyr for ESO 93-SC08, while ESO 452-SC11 has an age comparable to the average of the halo globular clusters. ESO 93-SC08 has a reddening of E(B-V) = 0.64 and is located at dsun~ 13.7 kpc from the Sun. It is a distant open cluster in the outer disk. ESO 452-SC11 appears to be a southern counterpart of the Palomar clusters. We derive a reddening of E(B-V) = 0.58, a distance dsun~ 6.5 kpc and a metallicity [Fe/H] ~ -1.5 for ESO 452-SC08. The deep CMD shows evidence of depletion at the lower main sequence, similarly to other poorly populated globular clusters. Observations collected at the European Southern Observatory - ESO, Chile.
Barbuy Batriz
Bica Eduardo
Ortolani Sergio
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