Table 1.
[Fe/H] (Carretta et al. 2009 for NGC 104, NGC 2808, NGC 6121, NGC 6723; Nardiello et al. 2015 for NGC 6352; Massari et al. 2017 for NGC 6362), [α/Fe], mean difference in helium ΔY between POPa and POPb (Milone et al. 2018) and absolute age of POPa, Age(POPa), (Dotter et al. 2010), considered to obtain the theoretical model of each GC.
| Cluster | [Fe/H] | [α/Fe] | ΔY | Age(POPa) |
|---|---|---|---|---|
| [Gyr] | ||||
| NGC 104 | −0.76 ± 0.02 | 0.4 | 0.011 ± 0.005 | 12.8 ± 0.5 |
| NGC 6121 | −1.18 ± 0.02 | 0.4 | 0.009 ± 0.006 | 12.5 ± 0.5 |
| NGC 6352 | −0.67 ± 0.02 | 0.4 | 0.019 ± 0.014 | 13.0 ± 0.5 |
| NGC 6362 | −1.07 ± 0.05 | 0.4 | 0.003 ± 0.011 | 12.5 ± 0.5 |
| NGC 6723 | −1.10 ± 0.07 | 0.4 | 0.005 ± 0.006 | 12.8 ± 0.5 |
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