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Table 11:

R' parameter as derived from both HST and ground based data (note the different definition with respect to the usual R parameter).

NGC /IC
R'(HST) R'(ground based) $\langle$R'$\rangle$ Y($\langle$R'$\rangle$)
104 0.69 $\pm$ 0.07 0.68 $\pm$ 0.09 0.69 $\pm$ 0.07 0.253 $\pm$ 0.012
288   0.69 $\pm$ 0.14 0.69 $\pm$ 0.14 0.250 $\pm$ 0.024
362 0.75 $\pm$ 0.08 0.63 $\pm$ 0.15 0.75 $\pm$ 0.08 0.260 $\pm$ 0.012
1257 0.49 $\pm$ 0.14   0.49 $\pm$ 0.14 0.213 $\pm$ 0.024
1261 0.62 $\pm$ 0.10 0.69 $\pm$ 0.09 0.62 $\pm$ 0.10 0.238 $\pm$ 0.017

Notes. The final adopted value $\langle$R'$\rangle$ is the weighted average between the two estimates, when available. Y($\langle$R'$\rangle$) is the corresponding He abundance. The complete table is available at the CDS.


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