Table 11
Number of stars of different populations of M 22.
| Population | FG | SG-I | SG-E | Total |
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| RGB: Marino et al. (2011a) | ||||
|
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| Metal-poor | 12 | 4 | 5 | 21 |
| Metal-Rich | – | 9 | 5 | 14 |
|
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| Frequency over the RGB and SGB (Marino et al. 2011a,b) | ||||
|
|
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| Metal-poor | 0.34 | 0.11 | 0.14 | 0.60 |
| Metal-rich | – | 0.26 | 0.14 | 0.40 |
|
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| BHB: This paper | ||||
|
|
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| Metal-poor | 49 | 23 | – | 72 |
| Metal-rich | – | 20 | – | 20 |
|
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| Frequency over the whole HB | ||||
|
|
||||
| Metal-poor | 0.39 | 0.15 | ~0.14 | ~0.68 |
| Metal-rich | – | >0.14 | ~0.14 | ~0.32 |
Notes. FG = first generation with primordial composition (normal He, low Na, high O); SG-I = second generation with intermediate composition (moderately high He and Na, moderately low O); SG-E = second generation with extreme characteristics (very high He and Na, very low O).
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