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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

Reference. 1. From Gratton et al. (2010); 2. Gratton et al. (2012a); 3. Marino et al. (2014); 4. Gratton et al. (2013); 5. Villanova et al. (2012); 6. This paper; 7. Villanova et al. (2009).

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