INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
The old open cluster Trumpler 5 and the chemical evolution of the galactic disc
Autor/es:
PIATTI, ANDRÉS E.; CLARIA OLMEDO, JUAN JOSÉ; AHUMADA, A.V.
Revista:
Bol. Asociación Argentina de Astronomía
Referencias:
Año: 2004 vol. 47 p. 244 - 247
Resumen:
We present CCD VIKC and Washington CT1 photometry in the field of
Trumpler 5. From the comparison of the cluster CMDs with theoretical
isochrones, the Standard Giant Branches method and measures of deltaV
and deltaT1, we derive reddening, distance, age and metallicity. We
examined the overall properties of all clusters with ages of 3 Gyr or
older. No evidence either for an abundance Z gradient or for an
age-metallicity relation is found. We suggest that the Galactic disc
might have been formed inside-out and that the relative lack of very old
clusters with Z > 0.5 kpc would be reflecting the transition between
the formation of the globular and open cluster systems.