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Abstract: We present the result of our investigation on the impact of the low Solarabundance of Asplund and collaborators 2004 on the derived ages for theoldest star clusters based on isochrone fittings. We have constructed newstellar models and corresponding isochrones using this new solar mixture with aproper Solar calibration. We have found that the use of the Asplund et al.2004 metallicity causes the typical ages for old globular clusters in theMilky Way to be increased roughly by 10\%. Although this may appear small, ithas a significant impact on the interpretation for the formation epoch of MilkyWay globular clusters. The Asplund et al. 2004 abundance may not necessarilythreaten the current concordance cosmology but would suggest that Milky Wayglobular clusters formed before the reionization and before the main galaxybody starts to build up. This is in contrast to the current understanding onthe galaxy formation.



Author: Sukyoung K. Yi, Yong -Cheol Kim

Source: https://arxiv.org/







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