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Table 4.
Published binary fractions for progenitors of blue HB stars.
| Population | Observed | Selection | Metallicity [Fe/H] | Reference |
|---|---|---|---|---|
| Binary Fraction | Effect Corrected* | |||
| BHB (this work) | 0% | < 2.2% | −1.7 ± 0.3 | – |
| RGB | ∼18 ± 6% | ∼57 ± 22%* | < − 3.0 ± 0.7 | Hansen et al. (2015) |
| RGB | ∼18 ± 4% | ∼34 ± 12%* | < − 2.0 ± 0.7 | Carney et al. (2003) |
| MS | ∼15 − 20% | 54 ± 12%* | –2.7 | Latham et al. (2002), Goldberg et al. (2002) |
| MS | 14 ± 2% | 20 ± 3%* | 0 | Latham et al. (2002), Goldberg et al. (2002) |
Notes. *Selection effect corrections to P = 10 000 days; a < 10 AU from Moe et al. (2019).
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