Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-11
Astron.Astrophys. 421 (2004) 603-612
Astronomy and Astrophysics
Astrophysics
11 pages, 14 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20034498
We present a determination of the distance modulus of the globular cluster NGC 5904 (M 5), obtained by means of the subdwarf main-sequence fitting on the (V,V-I) color-magnitude diagram. The subdwarf sample has been selected from the HIPPARCOS catalog in a metallicity range homogeneous with the cluster ([Fe/H] \~= -1.1). Both the cluster and the subdwarfs have been observed with the same telescope+instrument+filters setup (namely, ESO-NTT equipped with the SUSI2 camera), in order to preserve homogeneity and reduce systematic uncertainties. A set of archival HST data has then been used to obtain a deep and precise ridge line. These have been accurately calibrated in the ground photometric system by using the NTT data and used to fit the cluster distance modulus. By adopting the most commonly accepted values for the reddening, E(B-V) = 0.035 and 0.03, we obtain respectively mu_0 = 14.44 +- 0.09 +- 0.07 and mu_0 = 14.41 +- 0.09 +- 0.07, in agreement with recent determinations.
Andreuzzi Gloria
Chieffi Alessandro
Limongi Marco
Marconi Gianni
Testa Vincenzo
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