INVESTIGADORES
PARISI Maria Celeste
congresos y reuniones científicas
Título:
Overall properties of open clusters projected towards the galactic anticenter direction: Washington photometry of NGC 1817 and NGC 2251
Autor/es:
PARISI, M. C.; CLARIÁ, J. J.; PIATTI, A. E.; GEISLER, D.
Lugar:
La Plata - Argentina
Reunión:
Congreso; 48 Reunión de la Asociación Argentina de Astronomía; 2005
Institución organizadora:
Asociación Argentina de Astronomía
Resumen:
We present Washington photometry for red giant candidates in the open clusters NGC 1817 and NGC 2251. Published radial velocities are used to separate field stars from cluster giants. Effective temperatures and metal abundances are derived for each star. From new UBV and DDO photometric data, we also derive reddening and metal content for NGC 2251. The resulting mean metallicities are [Fe/H] = -0.33 + 0.08 and -0.20 + 0.05 for NGC 1817 and NGC 2251, respectively. We reexamine the overall properties of a sample of 30 clusters in the Galactic anticenter direction with distances, ages and metallicities available. This cluster sample presents no evidence of an abundance gradient perpendicular to the Galactic plane, nor is an age-metallicity relation found. However, a radial abundance gradient of -0.093 dex/kpc is derived over a Galactocentric distance of 14 kpc. This value practically does not change when all clusters with basic parameters known up to this date are considered.
