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Table A.2

Ionic abundancesa in NGC 6822 from VLT (11 PNe and one H ii region) and CFH (PN 17 and PN 20) data and for H V and H Xb.

Object PN 4 PN 5 PN 6 PN 7 PN 10 PN 12 PN 14 PN 16

Te([O iii]) (K) 17 950 ± 1250 <24 600 12 500 ± 750 13 270 ± 2400 18 200 ± 1150 12 900 ± 650 17 900 ± 1000 14 200 ± 700
Te([N ii]) (K) 14 200 ± 2650 15 350 ± 1500 11 600 ± 3100 20 500 ± 2500
ne([S ii]) (cm-3) 2450 700 3700 2300 1000 (adopted) 2000 (adopted) 4500 900
ne([Ar iv]) (cm-3) 1900: 1700 11 500: 4500

Ion 12 + log (X+i/H+)

He+ 10.81 ± 0.04 10.80 ± 0.16 10.98 ± 0.04 11.09 ± 0.10 11.15 ± 0.04 10.91 ± 0.06 10.72 ± 0.07 11.03 ± 0.05
He++ 10.29 ± 0.04 10.66 ± 0.05 8.93 <9.93 <9.36 10.30 ± 0.06 10.72 ± 0.02 10.42 ± 0.05
N+ 6.52 7.40 ± 0.09 6.39 6.48 5.46 ± 0.12 5.81 ± 0.09 7.31 6.21 ± 0.05
O+ 6.85 7.05 ± 0.24 7.15: 7.87: 6.74 ± 0.13 6.53 6.94 6.24 ± 0.13
O++ 7.68 ± 0.07 7.70 ± 0.11 8.11 ± 0.07 8.01 7.47 ± 0.06 8.20 ± 0.08 7.87 ± 0.05 8.15 ± 0.05
Ne++ 6.93 ± 0.08 7.34 ± 0.08 6.65 ± 0.08 7.36 ± 0.09 7.41 ± 0.07
Ne+4 6.52 ± 0.16
S+ 5.20 5.79 ± 0.10 5.16: 4.85 4.38 4.86 4.67
S++ 5.89 ± 0.10 6.21 5.91 5.88 ± 0.29 6.15 ± 0.12 5.56 5.86
Ar++ 5.31 ± 0.07 5.64 ± 0.11 5.55 ± 0.06 5.79 ± 0.19 4.88 5.62 ± 0.09 5.39 ± 0.09 5.41 ± 0.08
Ar+3 5.22 ± 0.09 5.23 ± 0.17 5.63 ± 0.11 5.32 ± 0.09 5.67 ± 0.08
Ar+4 4.50 5.13

Object PN 18 PN 19 PN 21 H ii 15 PN 17 PN 20 H V H X

Te([O iii]) (K) 18 950 ± 1900 22 050 ± 3300 16 200 ± 1200 12 150 ± 200 19 300 ± 3000 15 500 ± 4000 11 800 ± 250 11 950 ± 470
Te([O ii]) (K) 15 300 ± 900 14 300 ± 1100
Te([N ii]) (K) 12 000 ± 1800 15 800 ± 2850
ne([S ii]) (cm-3) 1150 <100 180 170 180 2000 (adopted) 80 <20
ne([O ii]) (cm-3) 70 50
ne([Cl iii]) (cm-3) 300 600 <20
ne([Ar iv]) (cm-3)

He+ <10.76 11.09 11.11 10.90 ± 0.02 10.98 10.91 10.92 ± 0.02 10.90 ± 0.04
He++ 10.82 ± 0.02 10.18 ± 0.07 9.37 10.54 ± 0.07 9.97
N+ 6.40 ± 0.09 6.15 5.88 6.08 6.06 ± 0.15 5.38 5.57 ± 0.15 5.80 ± 0.08
O+ 5.72 7.15 6.50 ± 0.16 7.58 7.28 7.06 6.87 7.14 ± 0.13
O++ 7.23 7.19 7.74 ± 0.08 7.86 ± 0.03 7.66 7.93 ± 0.02 8.04 ± 0.03 7.94 ± 0.06
Ne++ 6.65 6.96 7.12 ± 0.03 6.99 7.40 7.30 ± 0.04 7.18 ± 0.07
S+ 5.09 5.76: 5.06 ± 0.09 5.45 5.78 4.83 5.09 5.29
S++ 5.82: <3.61 6.30 ± 0.06 6.34 ± 0.05 6.35 ± 0.10
Cl++ 4.40 4.43 ± 0.06 4.38
Ar++ 5.30 5.40 ± 0.11 5.76 ± 0.04 5.63 ± 0.06 5.76 ± 0.03 5.75 ± 0.05
Ar+3 4.80 ± 0.10

Notes.Abundances in 12 + log (X+i/H+). H V and H X line intensities were adopted from Peimbert et al. (2005). Colons indicate errors larger than a factor of two.

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