Table 9
Different metallicity estimates for M 30 in the literature.
| Reference | [Fe/H]ZW | [Fe/H]UVES | Method |
|
|
|||
| This work | –2.01 ± 0.04 | −2.11 ± 0.06 | Fourier decomposition of RR Lyrae light curves |
| Carretta et al. (2009b) | –2.04 ± 0.16 | −2.34 ± 0.05 | UVES spectroscopy of red giants |
| Carretta et al. (2009c) | –2.05 ± 0.16 | −2.36 ± 0.05 | FLAMES/GIRAFFE specta of red giants |
| Sandquist et al. (1999) | –2.01 ± 0.09 | −2.11 ± 0.14 | Simultaneous reddening-metallicity method |
| Bergbusch (1996) | –2.03 | –2.14 | CMD isochrone fitting |
| Minniti et al. (1993) | –2.11 ± 0.08 | −2.27 ± 0.13 | Spectroscopy of red giants |
| Claria et al. (1988) | –2.4 | −2.78 ± 0.20 | Spectroscopy of red giants |
| Bolte (1987) | –2.03 ± 0.13 | −2.14 ± 0.20 | CMD isochrone fitting |
| Smith (1984) | –2.02 ± 0.14 | −2.13 ± 0.22 | 
spectral index |
| Zinn & West (1984) | –2.13 ± 0.13 | −2.31 ± 0.21 | Q39 spectral index |
| Zinn (1980) | –1.96 ± 0.12 | −2.04 ± 0.18 | Q39 spectral index |
Notes.Values were converted using Eq. (18) where necessary.
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