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Table 7
Average He abundances from the 5876 Å line for selected clusters.
| Cluster | [Fe/H] | Rel. Age (1) | log Teff(HB) | log Teff(HB) | log Teff(HB) | Ref. | N stars | log Teff | ⟨ Y ⟩ | rms |
| Min | Median | Max | Range | |||||||
|
|
||||||||||
| NGC 1851 | –1.18 | 0.81 | 3.73 | 3.74 | 4.08 | 2 | 19 | 3.95÷4.06 | 0.297 ± 0.020 | 0.088 |
| NGC 2808 | –1.18 | 0.83 | 3.75 | 3.92 | 4.57 | 3 | 17 | 3.96÷4.06 | 0.336 ± 0.013 | 0.052 |
| M 5 | –1.33 | 0.85 | 3.76 | 3.89 | 4.18 | 4 | 15 | 3.95÷4.02 | 0.312 ± 0.017 | 0.064 |
| M 4 | –1.18 | 0.97 | 3.72 | 3.76 | 4.04 | 5 | 6 | 3.95÷3.98 | 0.295 ± 0.011 | 0.028 |
| M 22 | –1.70 | 1.06 | 3.82 | 3.97 | 4.22 | 6 | 29 | 3.95÷4.03 | 0.338 ± 0.014 | 0.074 |
| NGC 6752 | –1.55 | 1.02 | 3.82 | 4.02 | 4.47 | 7 | 4 | 3.93÷3.94 | 0.252 ± 0.016 | 0.031 |
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