Issue |
A&A
Volume 421, Number 2, July II 2004
|
|
---|---|---|
Page(s) | 603 - 612 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20034498 | |
Published online | 22 June 2004 |
The distance to NGC 5904 (M 5) via the subdwarf main sequence fitting method*
1
INAF - OAR, via Frascati 33, 00040 Monteporzio Catone, Italy
2
IASF - CNR, via del Fosso del Cavaliere, 00100, Roma, Italy
3
INAF - TNG, Santa Cruz de La Palma, Canary Islands, Spain
4
ESO - Chile, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
Corresponding author: V. Testa, testa@mporzio.astro.it
Received:
13
October
2003
Accepted:
4
March
2004
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 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,
and 0.03, we obtain respectively
and
,
in agreement with recent determinations.
Key words: Galaxy: globular clusters: individual: NGC 5904 (M 5) / stars: distances
© ESO, 2004
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