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• W2890821749 abstract "We report for the first time on the magnitude of the intrinsic [Fe/H] spread among ten old globular clusters (GCs) of the Large Magellanic Cloud (LMC). Such spreads are merely observed in approximately five per cent of the Milky Way GCs and recently gained more attention in theoretical models of GC evolution. We derived metallicities with a typical precision of 0.05 dex < sigma[Fe/H] < 0.20 dex for an average of 14 red giant branch stars per GC from Stromgren photometry. The respective, metallicity-sensitive indices have been calibrated to precise and accurate high-dispersion spectroscopy. For all clusters we found null [Fe/H] spreads with a typical uncertainty of 0.04 dex, with the possible exception of NGC1786 that shows an intrinsic dispersion of 0.07+-0.04 dex. The mean, observed standard deviation of the derived metallicities for nearly 40 per cent of our GC sample amounted to smaller than 0.05 dex. At present, we cannot exclude that the remaining GCs also have intrinsic Fe-abundance variations in excess of 0.05 dex, but in order to significantly detect those, the measurement errors on individual [Fe/H]-values would need to be lowered to the 0.03--0.07 dex level. These findings suggest, along with those from ages and light-element abundances, that the LMC GCs studied here are alike to the majority of Galactic GCs." @default.
• W2890821749 created "2018-09-27" @default.
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• W2890821749 date "2018-10-25" @default.
• W2890821749 modified "2023-10-18" @default.
• W2890821749 title "Search for an Intrinsic Metallicity Spread in Old Globular Clusters of the Large Magellanic Cloud" @default.
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• W2890821749 doi "https://doi.org/10.3847/1538-4357/aadfe1" @default.
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