Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..182p&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
We present Washington photometry for red giant candidates in the open clusters NGC 1817 and NGC 2251. Coravel radial velocities are used to separate field stars from cluster giants. Effective temperatures and metallicities are derived for each giant star. From new UBV and DDO data, we also derive reddening and metal content for NGC 2251. We find [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. No evidence for an age-metallicity relation is found. However, a radial abundance gradient of -0.093 dex kpc^{-1} 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.
Claria Juan J.
Geisler Doug
Parisi María Celeste
Piatti Andrés E.
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