Table 3
Mean metallicities of RRLs in different sub-structures of the MW.
| Substructure |
N (CLiMB) |
[Fe/H] (CLiMB) this study |
N (D23) |
[Fe/H] (D23) this study |
[Fe/H] (D’Orazi et al. 2024) |
[Fe/H] (Cabrera Garcia et al. 2024) |
[Fe/H] (Sun et al. 2025) |
|---|---|---|---|---|---|---|---|
| Sequoia | 29 | −1.64 ± 0.26 | 29 | −1.64 ± 0.26 | −1.60 ± 0.33 | −1.70 ± 0.26 | −1.72 ± 0.32 |
| Thamnos: | 33 | −1.76 ± 0.33 | 22 | −1.75 ± 0.36 | −1.75 ± 0.28(*) | " " | " " |
| - Metal-rich component | 10 | −1.35 ± 0.12 | " " | " " | " " | " " | " " |
| - Metal-poor component | 23 | −1.94 ± 0.20 | " " | " " | " " | " " | " " |
| L-RL3 | 71 | −1.54 ± 0.33 | 25 | −1.56 ± 0.38 | " " | " " | " " |
| L-RL64 | 1 | −1.57 ± 0.41 | 1 | −1.57 ± 0.41 | " " | " " | " " |
| ED-2 | 2 | −1.94 ± 0.32 | 1 | −2.22 ± 0.34 | " " | " " | " " |
| GSE | 315 | −1.57 ± 0.25 | 273 | −1.56 ± 0.25 | −1.65 ± 0.29 | −1.61 ± 0.31 | −1.62 ± 0.32 |
| ED-1 | 18 | −1.57 ± 0.40 | 6 | −1.42 ± 0.28 | " " | " " | " " |
| Helmi streams | 12 | −1.66 ± 0.19 | 10 | −1.66 ± 0.19 | −1.67 ± 0.29 | −1.78 ± 0.33 | −1.78 ± 0.30 |
| Disc CLiMB: | 838 | −1.12 ± 0.48 | " " | " " | " " | " " | " " |
| - Thin disc | 238 | −0.75 ± 0.40 | " " | " " | " " | " " | " " |
| - Thick disc | 600 | −1.27 ± 0.42 | " " | " " | " " | " " | " " |
| Shiva | 30 | −1.38 ± 0.29 | " " | " " | " " | " " | " " |
| Shakti | 40 | −1.41 ± 0.38 | " " | " " | " " | " " | " " |
Notes. Column 1: name of the sub-structure. Column 2: number of RRLs in each sub-structure identified with the CLiMB algorithm, for which photometric metallicities from Muraveva et al. (2025) are available and have uncertainties smaller than 0.5 dex. Column 3: weighted mean metal-licity of RRLs identified as belonging to the sub-structure using the CLiMB algorithm, with uncertainties calculated as the weighted standard deviation of the mean. For sub-structures containing only one star, the uncertainty corresponds to the photometric metallicity uncertainty of that individual star. Column 4: same as Column 2, but for RRLs identified as part of the sub-structure through cross-matching with the D23 catalogue. Column 5: same as Column 3, but for RRLs identified as part of the sub-structure through cross-matching with the D23 catalogue. Column 6: mean metallicity of RRLs from D’Orazi et al. (2024). Column 7: mean metallicity of RRLs from Cabrera Garcia et al. (2024). Column 8: mean metallicity of RRLs from Sun et al. (2025). (*)D’Orazi et al. (2024) provided the mean metallicities for Thamnos I and Thamnos II separately. In the table, we report the average of the two values.
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