Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-08-26
2010, JKAS (Journal of the Korean Astronomical Society), 43, 135
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Latex with 4 colour figures, also available at http://jkas.kas.org/journals/2010v43n4/v43n4p135_yckim.pdf
Scientific paper
We present the result of our investigation on the impact of the low Solar abundance of Asplund and collaborators (2004) on the derived ages for the oldest star clusters based on isochrone fittings. We have constructed new stellar models and corresponding isochrones using this new solar mixture with a proper Solar calibration. We have found that the use of the Asplund et al. (2004) metallicity causes the typical ages for old globular clusters in the Milky Way to be increased roughly by 10\%. Although this may appear small, it has a significant impact on the interpretation for the formation epoch of Milky Way globular clusters. The Asplund et al. (2004) abundance may not necessarily threaten the current concordance cosmology but would suggest that Milky Way globular clusters formed before the reionization and before the main galaxy body starts to build up. This is in contrast to the current understanding on the galaxy formation.
Kim Yong--Cheol
Yi Sukyoung K.
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