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Table A.1.

Photoionisation model predictions

Aperture E(B-V) [OIII]λ4363 [OIII]λ5007 [NII]λ5755 [NII]λ6584 [SII]λ6725 [SII] λ 6716 λ 6731 $ \frac{\lambda 6716}{\lambda 6731} $ 12+log(O/H) log(N/O) T[OIII] T[NII] ne
K K cm−3
1 0.074±0.012 0.144±0.014 6.000±0.215 0.019±0.001 1.437±0.114 1.598±0.047 1.316±0.056 8.68±0.15 -0.86±0.11 16565±875 9508±312 149±79
2 0.155±0.015 0.141±0.012 5.802±0.588 0.017±0.001 1.396±0.044 1.507±0.051 1.396±0.026 8.61±0.13 -0.85±0.11 16739±1196 9236±225 34±36
3 0.054±0.013 0.135±0.015 6.043±0.251 0.020±0.002 1.044±0.042 1.467±0.060 1.349±0.048 8.76±0.11 -1.03±0.09 16058±1071 11185±448 100±63
4 0.034±0.013 0.158±0.012 7.290±0.251 0.018±0.002 1.012±0.048 1.359±0.071 1.382±0.027 8.69±0.10 -1.00±0.08 15801±699 10822±543 51±34
5 0.063±0.018 0.142±0.008 7.199±0.322 0.016±0.002 0.991±0.062 1.196±0.056 1.343±0.033 8.77±0.12 -0.99±0.08 15064±493 10325±565 109±41
6 0.046±0.017 0.143±0.010 6.885±0.319 0.019±0.001 1.086±0.063 1.326±0.078 1.321±0.036 8.69±0.12 -0.98±0.11 15433±641 10656±344 141±52
7 0.101±0.014 0.162±0.009 7.342±0.323 0.019±0.001 1.070±0.067 1.419±0.059 1.341±0.036 8.68±0.09 -1.00±0.08 15938±501 10743±353 114±50
8 0.087±0.021 0.128±0.014 5.665±0.326 0.020±0.001 1.291±0.112 1.589±0.088 1.369±0.046 8.76±0.15 -0.93±0.11 16181±1037 10134±391 74±60
9 0.031±0.013 0.145±0.006 6.900±0.316 0.020±0.002 1.195±0.069 1.423±0.072 1.394±0.021 8.72±0.10 -0.94±0.10 15453±442 10495±516 40±33
10 0.105±0.016 0.115±0.019 4.557±0.208 0.020±0.002 1.169±0.079 1.632±0.074 1.411±0.016 8.56±0.20 -0.98±0.11 16888±1484 10580±530 ≲35
Nucleus 0.186±0.033 0.086±0.014 6.550±0.310 0.021±0.003 1.497±0.157 0.920±0.059 1.242±0.138 8.66±0.11 -0.56±0.08 12772±785 9825±658 301±270
11 0.000±0.046 0.146±0.021 5.941±0.387 N/A 1.271±0.183 1.455±0.082 1.335±0.017 8.53±0.17 -0.85±0.15 16899±1339 N/A 115±22
12 0.132±0.015 0.113±0.014 3.570±0.170 N/A 1.350±0.061 1.865±0.085 1.450±0.050 8.52±0.14 -0.87±0.11 19540±1235 N/A 16±34
13 0.000±0.038 0.083±0.023 3.197±0.325 N/A 1.378±0.166 1.973±0.228 1.417±0.054 8.71±0.24 -0.89±0.14 17766±2661 N/A 34±47
14 0.031±0.025 0.175±0.035 6.901±0.531 N/A 1.244±0.104 1.684±0.126 1.330±0.029 8.53±0.15 -0.94±0.11 17197±2124 N/A 129±42
15 0.077±0.041 0.198±0.024 7.222±0.808 N/A 0.914±0.115 1.480±0.183 1.316±0.025 8.40±0.12 -0.94±0.13 17989±1652 N/A 145±34
16 0.023±0.015 0.271±0.040 8.844±0.387 N/A 0.647±0.072 1.382±0.319 N/A 8.37±0.08 -1.00±0.11 18829±1648 N/A N/A
17 0.029±0.020 0.222±0.017 8.941±0.404 N/A 1.123±0.102 1.339±0.146 1.429±0.061 8.49±0.05 -0.87±0.12 16910±754 N/A 33±48
18 0.121±0.012 0.102±0.023 3.917±0.210 N/A 1.097±0.058 1.602±0.191 1.466±0.030 8.56±0.24 -0.93±0.13 17299±2055 N/A ≲75
19 0.027±0.044 0.090±0.028 2.626±0.481 N/A 1.245±0.283 1.125±0.378 1.386±0.039 8.39±0.30 -0.86±0.28 18925±3439 N/A 48±45
20 0.077±0.031 0.087±0.016 3.075±0.420 N/A 1.494±0.282 1.888±0.284 1.396±0.039 8.60±0.25 -0.84±0.20 18398±2835 N/A 41±45
21 0.126±0.059 0.201±0.033 8.234±1.289 N/A 0.716±0.126 0.947±0.164 1.372±0.028 8.44±0.13 -0.94±0.16 16972±1929 N/A 70±38
22 0.000±0.007 0.154±0.012 7.099±0.143 N/A 0.776±0.038 1.164±0.338 N/A 8.44±0.18 -0.97±0.17 15798±608 N/A N/A

Notes. Model predictions of the O/H and N/O relative abundances, the electron temperatures, T[OIII] and T[NII] and electron densities ne inferred from the [SII] λ 6716 λ 6731 $ \frac{\lambda 6716}{\lambda 6731} $ ratio. The observed, extinction corrected line fluxes used in the models are quoted relative to Hβ. E(B-V) values were inferred from Hα/Hβ. The spatial location of the apertures can be seen in Fig. 3. Apertures 3 to 9 cover the edge of the ionised bubble. The top (lower) part of the table comprises the apertures in which [NII]λ5755 is detected (undetected). N/A in the [SII] λ 6716 λ 6731 $ \frac{\lambda 6716}{\lambda 6731} $ column means that the doublet ratio could not be measured accurately due to residual sky artefacts. The solar abundances are 12+log(O/H) = 8.69±0.04 and log(N/O) = -0.86±0.07 for the Sun (Asplund et al. 2021).

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