Table 3
Metallicity estimates and normalised cumulative rank (NCR) pixel index for the sample of BSG SNe.
| SN | 12 + log (O/H) | 12 + log (O/H) | 12 + log (O/H) | 12 + log (O/H) | 12 + log (O/H) | H ii region-SN | 12 + log (O/H) gradient | NCR |
| (indirect | (indirect | (N2 at the | (N2 at rSN, dex) | (N2 of the H ii | distance | (dex  ) |
||
| at the host center, | at rSN, dex) | host center, dex) | region closest | (kpc) | ||||
| dex) | to the SN, dex) | |||||||
|
|
||||||||
| 1909A | 9.13 | 8.30 | 8.79 ± 0.06 | 7.96 ± 0.10 | 8.23 ± 0.20 | 7.66 | –0.900 ± 0.085 | 0 |
| 1982F | 8.85 | 8.83 | 8.24 ± 0.09 | 8.26 ± 0.12 | 8.21 ± 0.20 | 0.36 | 0.078 ± 0.256 | 0.113 |
| 1987A | 8.57 | 8.45 | 8.46 ± 0.06** | 8.37 *** | – | – | –0.323 ± 0.215** | – |
| 1998A | 8.76 | 8.48 | 8.78 ± 0.03 | 8.68 ± 0.06 | 8.63 ± 0.20 | 0 | –0.157 ± 0.076 | 0.608 |
| 2000cb | 8.82 | 8.56 | 8.68 ± 0.03 | 8.45 ± 0.06 | 8.39 ± 0.20 | 1.24 | –0.411 ± 0.096 | 0 |
| NOOS...* | 8.94 | 8.50 | 9.02 ± 0.13 | 8.39 ± 0.28 | 8.57 ± 0.20 | 2.44 | –0.677 ± 0.250 | 0.076 |
| 2004ek | 8.94 | 8.59 | – | – | – | – | – | – |
| 2004em | 8.90 | 8.55 | 8.72 ± 0.05 | 8.56 ± 0.11 | 8.59 ± 0.20 | 1.16 | –0.213 ± 0.122 | 0.024 |
| 2005ci | 8.63 | 8.42 | 8.49 ± 0.02 | 8.31 ± 0.04 | 8.31 ± 0.20 | 0 | –0.412 ± 0.089 | 0.179 |
| 2005dp | 8.70 | 8.40 | 8.49 ± 0.03 | 8.27 ± 0.07 | 8.37 ± 0.20 | 3.38 | –0.336 ± 0.094 | 0.510 |
| 2006V | 9.16 | 8.72 | 8.81 ± 0.05 | 8.35 ± 0.11 | 8.36 ± 0.20 | 6.03 | –0.487 ± 0.101 | 0 |
| 2006au | 8.97 | 8.58 | 8.95 ± 0.06 | 8.49 ± 0.12 | 8.54 ± 0.20 | 0 | –0.562 ± 0.113 | 0.073 |
| 2009E | 8.48 | 8.21 | 8.44 ± 0.05 | 8.22 ± 0.08 | 8.22 ± 0.20 | 0 | –0.391 ± 0.112 | 0.857 |
| ⟨BSG SNe⟩ | 8.83 ± 0.06 | 8.51 ± 0.04 | 8.66 ± 0.07 | 8.36 ± 0.05 | 8.40 ± 0.05 | 2.02 ± 0.80 | –0.399 ± 0.072 | 0.222 ± 0.089 |
Notes. In the 2nd and 3rd columns we report the indirect metallicity estimates at the host center and at the SN distance. The direct metallicity measurements at the host center and at the SN distance are reported in the 4th and 5th columns. The quoted error is the fit uncertainty. The systematic error for the N2 method is 0.18 dex. Columns 6 and 7 include the oxygen abundance of the H ii region closest to the SN position, and the distance in kpc between this H ii region and the SN position. The last two columns show the measured host metallicity gradient and the NCR index for each SN. The mean value and the uncertainty of each quantity for the entire sample is reported in the last row of the table.
From Pagel et al. (1978).
From Russell & Dopita (1990); it is the average metallicity of the H ii regions in the LMC.
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