Table 1.
Width of the instability strip, as measured in the observations and predicted with our models.
| Band | Obs. | Notes | Z = 0.014 | Z = 0.006 | Z = 0.002 |
|---|---|---|---|---|---|
| [mag] | [mag] | [mag] | [mag] | ||
| GBP | 0.23 | A/Ri19 | 0.246 | 0.218 | 0.176 |
| V | 0.22 | B/M06 | 0.236 | 0.207 | 0.166 |
| G | 0.19 | A/Ri19 | 0.208 | 0.188 | 0.153 |
| GRP | 0.16 | A/Ri19 | 0.171 | 0.155 | 0.125 |
| I | 0.14 | B/M06 | 0.165 | 0.151 | 0.122 |
| F090W | – | – | 0.146 | 0.133 | 0.111 |
| F115W | – | – | 0.118 | 0.113 | 0.096 |
| J | 0.11 | A/P04 | 0.112 | 0.110 | 0.095 |
| F150W | – | – | 0.087 | 0.092 | 0.082 |
| H | 0.09 | A/P04 | 0.073 | 0.084 | 0.076 |
| Ks | 0.07 | A/P04 | 0.067 | 0.080 | 0.074 |
| F277W | – | – | 0.070 | 0.081 | 0.074 |
| F356W | – | – | 0.065 | 0.079 | 0.073 |
| F444W | – | – | 0.071 | 0.082 | 0.075 |
| WG | 0.10 | A/Ri19 | 0.077 | 0.086 | 0.075 |
| WVI | 0.077 | A/S15 | 0.079 | 0.087 | 0.075 |
| WH | 0.069 | A/SH0ES | 0.058 | 0.075 | 0.070 |
| WVK | 0.077 | A/Ri22 | 0.054 | 0.074 | 0.069 |
| WJK | 0.086 | A/Ri22 | 0.051 | 0.073 | 0.068 |
Notes. There are only small differences, at the 0.005 mag level, in the dispersion predicted when one accounts for the flux contribution from companion stars or only for that of the primary stars alone so we decided to only show the former set of values here. A: LMC, B: NGC 4258; Ri19: Ripepi et al. (2019), M06: Macri et al. (2006), P04: Persson et al. (2004), S15: Soszyński et al. (2015), SH0ES: Riess et al. (2019), and Ri22: Ripepi et al. (2022).
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