Table 2
Physical parameters in our binary population models and the derived CEMP/VMP ratio.
| Model set | Ang. mom. loss | βacc | Third dredge up | CEMP/VMP (%) |
|
|
||||
| A | as Hurley et al. (2002) | BHL | standard | 2.30 ± 0.04 |
| A′ | ssw – Eq. (4) | BHL | standard | 2.31 ± 0.04 |
|
|
||||
| B | ssw – Eq. (4) | BHL | standard | 2.22 ± 0.04 |
| C | ssw – Eq. (4) | WRLOF | standard | 2.90 ± 0.04 |
| Cq | ssw – Eq. (4) | WRLOF q-dep | standard | 2.63 ± 0.04 |
| D | γ2 – Eq. (10) | BHL | standard | 3.12 ± 0.04 |
| E | γ2 – Eq. (10) | WRLOF | standard | 4.06 ± 0.03 |
| Eq | γ2 – Eq. (10) | WRLOF q-dep | standard | 3.85 ± 0.04 |
|
|
||||
| G | ssw – Eq. (4) | BHL | enhanced | 9.00 ± 0.12 |
| J | ssw – Eq. (4) | WRLOF | enhanced | 11.15 ± 0.13 |
| Jq | ssw – Eq. (4) | WRLOF q-dep | enhanced | 11.91 ± 0.14 |
| I | γ2 – Eq. (10) | BHL | enhanced | 10.27 ± 0.13 |
| K | γ2 – Eq. (10) | WRLOF | enhanced | 12.96 ± 0.14 |
| Kq | γ2 – Eq. (10) | WRLOF q-dep | enhanced | 13.66 ± 0.14 |
Notes.Model set A is the same as in the article by I09. All models use the wind velocity prescription of Vassiliadis & Wood (1993) except model sets A and A′ where vw ∝ vesc. The errors convey only Poisson statistics and could be reduced by increasing the resolution N of our grid of models. A finer grid is not necessary because the observed CEMP/VMP ratio varies between 9% and 25%, a much wider range than the errors in our models.
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