INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
The old open cluster Trumpler 5: a reddened, metal-poor anticentre cluster
Autor/es:
PIATTI, ANDRÉS E.; CLARIA OLMEDO, JUAN JOSÉ; AHUMADA, A.V.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Referencias:
Año: 2004 vol. 349 p. 641 - 648
ISSN:
0035-8711
Resumen:
CCD observations in the Johnson V, Kron-Cousins I and the Washington
system C and T1 passbands have been used to generate
colour-magnitude diagrams (CMDs) reaching down to V~ 21.0 mag and
T1~ 19.0 for Trumpler 5, an old open cluster located towards
the Galactic anticentre. Our data analysis confirms the existence of
non-uniform extinction over the face of the cluster, the mean E(V-I) and
E(C-T1) values being 0.80 +/- 0.05 and 1.17 +/- 0.15,
respectively. Through comparison of the cluster CMDs with theoretical
isochrones of the Geneva group, Washington Standard Giant Branches and
measures of δV and δT1 indices, we derive the
following values for the cluster apparent distance modulus, age, and
metallicity: V-MV= 13.80 +/- 0.30 (corresponding to a
distance from the Sun of 2.4 +/- 0.5 kpc and 0.04 kpc above the Galactic
plane), t= 5.0 +/- 0.5 Gyr and [Fe/H]=-0.30 +/- 0.15. We estimate the
cluster angular radius to be about 7.7 arcmin (=5.4 pc) from star counts
carried out within and outside the cluster field.