Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-25
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, accepted for publication in Astronomy & Astrophysics
Scientific paper
10.1051/0004-6361:20041053
We present distance modulus and reddening determinations for 72 Galactic globular clusters from the homogeneous photometric database of Piotto et al. (2002), calibrated to the HST flight F439W and F555W bands. The distances have been determined by comparison with theoretical absolute magnitudes of the ZAHB. For low and intermediate metallicity clusters, we have estimated the apparent Zero Age Horizontal Branch (ZAHB) magnitude from the RR Lyrae level. For metal rich clusters, the ZAHB magnitude was obtained from the fainter envelope of the red HB. Reddenings have been estimated by comparison of the HST colour-magnitude diagrams (CMD) with ground CMDs of low reddening template clusters. The homogeneity of both the photometric data and the adopted methodological approach allowed us to obtain highly accurate relative cluster distances and reddenings. Our results are also compared with recent compilations in the literature.
Aparicio Antonio
Cassisi Santi
de Angeli Francesca
Pietrinferni Adriano
Piotto Giampaolo
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