Table 2
Evaluation of the quality of the photometric metallicities from the Pristine-Gaia synthetic catalogue.
| Observed with recommended quality cuts | Stricter quality cuts | [Fe/H]phot < −2.5 | |
|---|---|---|---|
| Total observed | 215 | 173 | 168 |
| [Fe/H]phot < −2.5 | 210 | 168 | 168 |
| [Fe/H]phot < −3.0 | 60 | 38 | 38 |
| [Fe/H]spec < −2.5 | 163 | 130 | 129 |
| [Fe/H]spec < −3.0 | 32 | 21 | 21 |
| [Fe/H]spec > −2.0 (outliers) | 9 (4%) | 6 (3%) | – |
| success [Fe/H] < −2.0 | 206 (96%) | 166 (97%) | – |
| success [Fe/H] < −2.5 | 162 (77%) | 129 (77%) | — |
| success [Fe/H] < −3.0 | 23 (38%) | 14 (37%) | – |
Notes. The number of stars with photometric metallicities from the Pristine-Gaia synthetic catalogue below −2.5 and −3.0, the number of stars confirmed spectroscopically below those metallicity thresholds, and the corresponding success rates are provided for three distinct datasets: the entire spectroscopic sample after basic quality cuts, the sample post-application of the stricter selection criteria to increase the 1:1 agreement in photometric and spectroscopic metallicities, and the subset of stars with photometric metallicities below −2.5.
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