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)|
|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|
|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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