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Table 7
Different metallicity estimates for NGC 1904 in the literature.
| Reference | [Fe/H] ZW | Method |
|
|
||
| This work | –1.63 ± 0.14 | Fourier decomposition of RR Lyrae light curves |
| Kraft & Ivans (2003) | –1.68 | EW of Fe II spectral lines |
| Carretta & Gratton (1997) | –1.36 ± 0.09 | Spectroscopy of red giants |
| Kravtsov et al. (1997) | –1.76 ± 0.20 | CMD analysis |
| Francois (1991) | –1.46 ± 0.15 | Q39 spectral index |
| Gratton & Ortolani (1989) | –1.42 ± 0.23 | Absorption line strength indices |
| Brodie & Hanes (1986) | –1.70 ± 0.23 | Absorption line strength indices |
| Smith (1984) | –1.43 ± 0.20 | Corrected Q39 index |
| Nelles & Seggewiss (1984) | –1.78 ± 0.25 | Calibration of VBLUW indices |
| Zinn & West (1984) | –1.69 ± 0.09 | Q39 spectral index |
| Zinn (1980) | –1.76 ± 0.05 | Q39 spectral index |
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