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Table 1
Summary of results on Na-O abundances along the HB in various clusters.
| Cluster | Red HB | Blue HB |
|
|
||
| 47 Tuc | [Na/O] correlates with colour | |
| (Gratton et al. 2013) | (increases as B-V decreases) | |
|
|
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| NGC 1851 | Mostly O-rich/Na-poor | Na-rich/O-poor |
| (Gratton et al. 2012a) | 10−15% Na-rich, moderately O-poor | (Na-O anticorrelation) |
| Mostly descendants from b-SGB | Mostly descendants from f-SGB | |
|
|
||
| NGC 2808 | O-rich | Moderately O-poor |
| (Gratton et al. 2011) | Spread Na (correlated with colour) | Moderately Na-rich |
|
|
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| M 5 | Na-poor, O-rich | Na-O anticorrelation |
| (Gratton et al. 2013) | Most stars with abundances | |
| similar to RHB stars | ||
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