Table 3
Median uncertainties for distance modulus (
) and log(age) (στ) for five datasets derived for each survey.
| Survey | Complete survey (dataset 1) | TGAS overlap (dataset 2) | TGAS parallaxes (dataset 3) | TGAS parallaxes, EoM precision (dataset 4) | UniDAM parallaxes, EoM precision (dataset 5) |
|---|---|---|---|---|---|
| Parallaxes: | – | – | TGAS | TGAS | UniDAM |
| Parallax precision: | – | – | TGAS | EoM | EoM |
| Survey data: | Full | TGAS overlap | Fulla | ||
1. Median distance modulus uncertainty ( ) (mag) | |||||
| APOGEE DR14 | 0.233 | 0.207 | 0.177 | 0.023 | 0.094 |
| GALAH DR1 | 0.547 | 0.549 | 0.283 | 0.014 | 0.012 |
| GCS | 0.287 | 0.288 | 0.046 | 0.002 | 0.002 |
| Gaia-ESO DR2 | 0.232 | 0.229 | 0.108 | 0.005 | 0.106 |
| LAMOST DR3 | 0.287 | 0.123 | 0.100 | 0.011 | 0.048 |
| LAMOST GAC DR2 | 0.375 | 0.260 | 0.166 | 0.011 | 0.119 |
| LAMOST GAC VB DR2 | 0.327 | 0.313 | 0.209 | 0.011 | 0.029 |
| LAMOST-Cannon | 0.352 | 0.327 | 0.248 | 0.023 | 0.076 |
| RAVE DR5 | 0.377 | 0.372 | 0.226 | 0.012 | 0.016 |
| RAVE-on | 0.373 | 0.376 | 0.219 | 0.013 | 0.019 |
| SEGUE | 0.497 | – | – | – | 0.231 |
| TESS-HERMES DR1 | 0.397 | 0.358 | 0.217 | 0.009 | 0.011 |
| 2. Median log(age) uncertainty (στ) (dex) | |||||
| APOGEE DR14 | 0.206 | 0.188 | 0.169 | 0.088 | 0.138 |
| GALAH DR1 | 0.289 | 0.289 | 0.157 | 0.088 | 0.116 |
| GCS | 0.134 | 0.133 | 0.073 | 0.070 | 0.083 |
| Gaia-ESO DR2 | 0.237 | 0.223 | 0.095 | 0.073 | 0.167 |
| LAMOST DR3 | 0.302 | 0.089 | 0.074 | 0.063 | 0.172 |
| LAMOST GAC DR2 | 0.312 | 0.242 | 0.153 | 0.083 | 0.213 |
| LAMOST GAC VB DR2 | 0.275 | 0.224 | 0.146 | 0.092 | 0.122 |
| LAMOST-Cannon | 0.224 | 0.224 | 0.198 | 0.116 | 0.158 |
| RAVE DR5 | 0.234 | 0.215 | 0.158 | 0.092 | 0.120 |
| RAVE-on | 0.245 | 0.227 | 0.167 | 0.093 | 0.133 |
| SEGUE | 0.349 | – | – | – | 0.303 |
| TESS-HERMES DR1 | 0.242 | 0.185 | 0.093 | 0.054 | 0.092 |
Notes. First three rows describe data used for each dataset: which values of parallaxes and parallax uncertainties were used and what part of the survey was used (see for more details Sect. 3). (a) There is a small (less than 3%) fraction of stars in each survey that do not have Gaia DR1 counterpart and are therefore not included into dataset 5.
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