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Table 9
Different metallicity estimates for M 68 in the literature.
| Reference | [Fe/H] ZW | [Fe/H] UVES | Method |
|
|
|||
| This work | −2.07 ± 0.06 | −2.20 ± 0.10 | Fourier decomposition of RRL light curves |
| This work | −2.09 ± 0.26 | −2.24 ± 0.42 | MV-[Fe/H] relation |
| Carretta et al. (2009b) | −2.10 ± 0.04 | −2.27 ± 0.07 | UVES spectroscopy of red giants |
| Carretta et al. (2009c) | −2.08 ± 0.04 | −2.23 ± 0.07 | FLAMES/GIRAFFE spectra of red giants |
| Rutledge et al. (1997) | −2.11 ± 0.03 | −2.27 ± 0.05 | CaII triplet |
| Harris (1996) | −2.23 | −2.47 | Globular cluster catalogue |
| Suntzeff et al. (1991) | −2.09 | −2.24 | Spectroscopy of RR Lyrae/ ΔS index |
| Gratton & Ortolani (1989) | −1.92 ± 0.06 | −1.97 ± 0.09 | High-resolution spectroscopy |
| Minniti et al. (1993) | −2.17 ± 0.05 | −2.37 ± 0.08 | FeI and FeII spectral lines |
| Zinn & West (1984) | −2.09 ± 0.11 | −2.24 ± 0.18 | Q39 index |
| Zinn (1980) | −2.19 ± 0.06 | −2.41 ± 0.10 | Q39 index |
Notes. Values were converted using Eq. (11) where necessary.
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