Abstract
Cohen: Although there are uncertainties of 2 × 109 years in globular cluster ages, if one assumes they all have same He abundance, the relative ages between clusters should be better. (If one is not willing to assume this, all cluster distances are suspect, anyway.) You count a mean age difference of at least 2 × 10 years between cluster at 7 kpc and at 40 kpc to explain the second parameter problem. Increasing numbers of CM diagrams for globular clusters in outer halo now exist and show the same age for globular clusters. Given better statistics, can one eliminate age as the second parameter?
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© 1988 International Astronomical Union
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Grindlay, J.E., Davis Philip, A.G. (1988). Discussion. In: Grindlay, J.E., Davis Philip, A.G. (eds) The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies. International Astronomical Union / Union Astronomique Internationale, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-1104-9_6
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DOI: https://doi.org/10.1007/978-94-015-1104-9_6
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