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Table 2

Column densities and ionization fractions.

Star log(N(HI)) (cm−2) log(NeWNM$\[N_{\mathrm{e}}^{\mathrm{WNM}}\]$) (cm−2) log(xH)
(a) (b) (c)
HZ43A 17.73 ± 0.05 16.75±0.420.47$\[16.75 \pm_{0.42}^{0.47}\]$ 0.10±0.060.19$\[0.10 \pm_{0.06}^{0.19}\]$
PG1544+488 19.66 ± 0.07 18.62 ± 0.17 0.090±0.0200.024$\[0.090 \pm_{0.020}^{0.024}\]$
PG1610+519 20.0 ± 0.08 19.36 ± 0.21 0.23±0.060.09$\[0.23 \pm_{0.06}^{0.09}\]$
HD 113001 19.65 ± 0.10 < 18.2 < 0.035
Ton102 19.52±0.230.34$\[19.52 \pm_{0.23}^{0.34}\]$ 18.35±1.090.71$\[18.35 \pm_{1.09}^{0.71}\]$ 0.072±0.0650.165$\[0.072 \pm_{0.065}^{0.165}\]$
PG1051+501 19.93±0.250.38$\[19.93 \pm_{0.25}^{0.38}\]$ < 18.35 < 0.021
PG0952+519 19.36 ± 0.05 18.46 ± 0.14 0.126±0.0240.03$\[0.126 \pm_{0.024}^{0.03}\]$
Feige 34 19.11±0.230.31$\[19.11 \pm_{0.23}^{0.31}\]$ 17.95±1.560.76$\[17.95 \pm_{1.56}^{0.76}\]$ 0.069±0.0660.215$\[0.069 \pm_{0.066}^{0.215}\]$
PG1032+406 19.17±0.250.29$\[19.17 \pm_{0.25}^{0.29}\]$ 17.98±0.940.82$\[17.98 \pm_{0.94}^{0.82}\]$ 0.066±0.0760.324$\[0.066 \pm_{0.076}^{0.324}\]$
HD 93521 19.70 ± 0.08 18.71±0.210.19$\[18.71 \pm_{0.21}^{0.19}\]$ 0.102±0.0360.051$\[0.102 \pm_{0.036}^{0.051}\]$

Notes. (a): Log10 of the column density of HI derived from that of OI. (b): Log10 of the column density of electrons. (c): Hydrogen ionization fraction.

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