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Table A.10:

Physical conditions and chemical abundances of the ionized gas in POX 4, UM 420, and SBS 0926+606.
Object POX 4 POX 4 Compa UM 420 SBS 0926+606A SBS 0926+606Ba
$T_{\rm e}$(O III) (K) $14~000 \pm 500$ $12~400 \pm 1000$ $13~200 \pm 600$ $13~600 \pm 700$ $11~500 \pm 1000 $
$T_{\rm e}$(O II) (K) $12~800 \pm 400$ $11~800 \pm 600$ $12~200 \pm 500$ $12~500 \pm 500$ $11~000 \pm 800$
$n_{\rm e}$ (cm-3) $250 \pm 80$ <100 $140 \pm 80$ <100 <100
12+log(O+/H+) 7.21 $\pm$ 0.04 7.85 $\pm$ 0.14 7.63 $\pm$ 0.05 7.38 $\pm$ 0.10 7.73 $\pm$ 0.16
12+log(O++/H+) 7.96 $\pm$ 0.04 7.55 $\pm$ 0.11 7.67 $\pm$ 0.05 7.80 $\pm$ 0.08 7.04 $\pm$ 0.15
12+log(O/H) 8.03 $\pm$ 0.04c 8.03 $\pm$ 0.13 7.95 $\pm$ 0.05c 7.94 $\pm$ 0.08c 8.15 $\pm$ 0.16
log(O++/O+) 0.74 $\pm$ 0.06 -0.30 $\pm$ 0.22 0.00 $\pm$ 0.08 0.42 $\pm$ 0.12 0.21 $\pm$ 0.14
12+log(N+/H+) 5.68 $\pm$ 0.04 6.25 $\pm$ 0.18 6.52 $\pm$ 0.05 5.93 $\pm$ 0.05 6.39 $\pm$ 0.09
12+log(N/H) 6.50 $\pm$ 0.06 6.43 $\pm$ 0.22 6.84 $\pm$ 0.06 6.48 $\pm$ 0.10 6.80 $\pm$ 0.13
log(N/O) -1.54 $\pm$ 0.06 -1.60 $\pm$ 0.20 -1.11 $\pm$ 0.07 -1.45 $\pm$ 0.09 -1.35 $\pm$ 0.12
12+log(S+/H+) 5.28 $\pm$ 0.03 5.62 $\pm$ 0.20 5.61 $\pm$ 0.11 5.61 $\pm$ 0.04 6.12 $\pm$ 0.11
12+log(S++/H+) 6.03 $\pm$ 0.08 ... 6.16 $\pm$ 0.09 6.17 $\pm$ 0.11 ...
12+log(S/H) 6.24 $\pm$ 0.07 ... 6.29 $\pm$ 0.10 6.34 $\pm$ 0.10 ...
log(S/O) -1.80 $\pm$ 0.10 ... -1.66 $\pm$ 0.13 -1.60 $\pm$ 0.13 ...
12+log(Ne++/H+) 7.18 $\pm$ 0.06 6.97: 6.96 $\pm$ 0.09 ... ...
12+log(Ne/H) 7.26 $\pm$ 0.06 7.40: 7.24 $\pm$ 0.09 ... ...
log(Ne/O) -0.78 $\pm$ 0.10 -0.60: -0.71 $\pm$ 0.13 ... ...
12+log(Ar+2/H+) ... ... ... 5.52 $\pm$ 0.07 5.54 $\pm$ 0.15
12+log(Ar+3/H+) 5.03 $\pm$ 0.07 ... ... 4.61 $\pm$ 0.18 ...
12+log(Ar/H) ... ... ... 5.60 $\pm$ 0.11 ...
log(Ar/O) ... ... ... -2.34 $\pm$ 0.13 ...
12+log(Cl++/H+) 3.83 $\pm$ 0.14 ... 4.18 $\pm$ 0.26 ... ...
12+log(Fe++/H+) 5.14 $\pm$ 0.10 ... 5.52 $\pm$ 0.12 5.47 $\pm$ 0.14 ...
12+log(Fe/H) 5.86 $\pm$ 0.10 ... 5.79 $\pm$ 0.13 5.95 $\pm$ 0.15 ...
log(Fe/O) -2.17 $\pm$ 0.11 ... -2.16 $\pm$ 0.13 -1.99 $\pm$ 0.16 ...
12+log(He+/H+) 10.91 $\pm$ 0.03 ... 10.88 $\pm$ 0.04 10.94 $\pm$ 0.04 11.0:
[O/H]b -0.63 $\pm$ 0.09 -0.63 -0.71 $\pm$ 0.10 -0.72 $\pm$ 0.13 -0.51

a Electron temperatures estimated using empirical relations; b [O/H] = $\log$(O/H)-log(O/H)$_{\odot}$, using 12+log(O/H) $_{\odot} = 8.66 \pm 0.05$ (Asplund et al. 2005); c considering the existence of O+3 because of the detection of He II $\lambda $4686, this value should be $\sim$0.01-0.02 dex higher.


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