Table 2
χ2 and CCF grid search results (see Sect. 6.1).
| Parameter | Unit | χ2 grid | CCF grid | ||
|---|---|---|---|---|---|
| Optimum | 1-σ | 2-σ | Optimum | ||
| Teff | (K) | 1500 | (+3)(−1) | (+100)(−5) | 2000 |
| log g | (cgs) | 3.5 | (+0.0)(−0.3) | (+0.0)(−0.5) | 3.5 |
| [Fe/H] | (dex) | 0.0 | (+0.0)(−0.3) | (+0.0)(−0.5) | 0.0 |
| C/O | 0.70 | (+0.01)(−0.00) | (+0.10)(−0.01) | 0.65 | |
| (†)vr | (km s−1) | 0.78 | ± 0.79 | −1.10 | |
| (†)a | 0.999 | ± 0.025 | Fixed to 1 | ||
| (†)v sin i | (km s−1) | Fixed to 25 | Fixed to 25 | ||
| R | Fixed to 4020 | Fixed to 4020 | |||
| χ2r | 1 | ||||
| max(CCF) | 0.69 | ||||
Notes. The reduced optimum χ2 has been normalised to 1 and is therefore not given here. Uncertainties are obtained by interpolation of the 1D ∆χ2 maps. (†)The 1-σ error bars for vr, v sin i, and a are obtained for the optimal model using scipy’s curve_fit procedure. The v sin i and a are not optimised for the CCF, assuming v sin i=25 km s−1 and a=1.
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