Table 4.
Median and 1-σ dispersion of SR and FWHM errors and mean square error obtained over the 129 H-band and high SR (> 40%) Keck/NIRC2 images treated in this analysis for the three implemented strategies: (i) PSD/stellar parameters retrieval, (ii) including the residual NCPA map in the model, and (iii) also including the estimation of Keck II cophasing errors.
| Strategy | Δ SR (pts) | ΔFWHM (mas) | MSE (%) | ||
|---|---|---|---|---|---|
| (SR > 40%) | Median | Std | Median | Std | |
| (i) | 1.4 | 1.9 | −0.9 | 0.8 | 0.81 |
| (ii) | 1.0 | 1.8 | −0.7 | 0.8 | 0.54 |
| (iii) | 0.7 | 1.1 | −0.5 | 0.4 | 0.32 |
Notes. Systematically, accounting for the NCPA map allows us to slightly reduce the biases on the estimates and diminish the MSE, but best model-fitting results are obtained thanks to cophasing error retrieval that decreases the MSE by almost a factor three.
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