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Table 5.
cn coefficients for our strong-line diagnostic calibrations.
| Diagnostic | c0 | c1 | c2 | c3 | c4 | σ | RMS |
|---|---|---|---|---|---|---|---|
| R3 | −0.84 | −5.86 | −6.27 | −1.95 | / | 0.22 | 0.44 |
| N2 | −0.41 | 0.57 | −4.91 | −5.81 | −1.95 | 0.14 | 0.25 |
| O3N2 | −0.51 | −7.74 | −6.12 | −1.60 | / | 0.18 | 0.66 |
| N2S2Hα | 0.24 | 2.21 | 0.76 | / | / | 0.17 | 0.26 |
Notes. The σ column represents the scatter in metallicity, expressed as 12 + log(O/H), at fixed line ratio. The RMS column reports the root-mean-square of residuals of the fit; that is, the scatter in line ratios at fixed metallicity.
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