Elemental Abundances in the Old Open Clusters NGC2243 and MELOTTE:66

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Star: Abundances - Open Clusters: Individual: Ngc 2243, Mel 66- Galaxy: Abundances - Galaxy: Evolution

Scientific paper

High dispersion, high S/N CCD spectra of two giants in each of the old, metal-poor open clusters NGC 2243 and Melotte 66 are used to derive their chemical composition. We found [Fe/H]=-0.48±0.15 and [Fe/H]=-0.38±0.15 for NGC 2243 and Melotte 66 respectively; these values are close to those deduced from photometry, but much larger than those derived from low S/N photographic spectra of the same stars. At the level of accuracy of element-to-element abundance ratios derived in this paper (±0.1 dex), the composition of NGC 2243 and Melotte 66 cannot be distinguished from that of stars of similar metallicity in the solar neighborhood.

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