Table 2
Frequency of stars from different sub-samples that display a helium abundance by mass (Y) larger than the specified limit by at least 2σY.
| f(Y) | |||
|
|
|||
| Sample | >0.30 | >0.35 | >0.40 |
|
|
|||
| LC III 39 (2) stars | 0.08 ± 0.04 | 0.05 ± 0.04 | 0.00 ±n/a |
| LC II 21 (10) stars | 0.05 ± 0.05 | 0.00 ±n/a | 0.00 ±n/a |
| LC I 6 (1) stars | 0.17 ± 0.15 | 0.17 ± 0.15 | 0.17 ± 0.15 |
| LC III to I 66 (13) stars | 0.08 ± 0.03 | 0.05 ± 0.03 | 0.02 ± 0.02 |
Notes. The sample consists of 66 sources. We provide the number of stars with ambiguous LC in parentheses. The error bars indicate the 68%-confidence intervals on the given fractions and were computed using simulated samples and binomial statistics.
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