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Table 4
Ionic abundances in NGC 6822 objects from GTC data.
| Object | PN 2 | PN 8 | PN 11 | PN 13 | PN 23 | PN 24 | H II | H III |
|
|
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| Te([O iii]) (K) | 18 300 ± 3800 | 20 300 ± 3900 | – | 20 000 ± 3000 | <14 700 | 16 300 ± 3300 | <16 700 | 12 600 ± 1000 |
| Te([N ii]) (K) | – | – | 17 650 ± 5750 | – | – | 15 850 ± 8700 | – | – |
| ne([S ii]) (cm-3) | 750 |
6250: | 550 |
<100 | 100 |
200 |
<100 | 60 |
|
|
||||||||
| Ion | 12 + log (X+i/H+) | |||||||
|
|
||||||||
| He+ | 11.26 ± 0.13 | 10.57 |
– | 11.08 ± 0.06 | 10.89 |
<11.15 | 11.02 ± 0.06 | 10.96 ± 0.02 |
| He++ | <9.73 | 10.82 ± 0.04 | – | <10.19 | >10.40 | 10.79 |
– | – |
| N+ | 5.68 |
5.84 |
7.78 |
5.41 ± 0.20 | >6.62 | 6.60: | >6.18 | 6.15 |
| O+ | 6.72: | 5.83: | <7.51 | 6.71 |
>7.43 | – | >7.49 | 7.74 |
| O++ | 7.47 |
7.05 |
7.35 |
7.61 |
>8.07 | 7.83 |
>7.07 | 7.59 |
| Ne++ | 6.74 |
<6.08 | – | – | – | – | – | 6.77 |
| S+ | 4.44 |
4.45 |
5.90 ± 0.23 | 4.78 |
>5.51 | 5.28 |
>5.72 | 5.85 |
| S++ | – | – | – | – | – | – | – | – |
| Ar++ | 4.83 |
4.79 |
5.77 ± 0.28 | <5.22 | >5.56 | 5.51 |
>5.43 | 5.65 |
| Ar+4 | – | 4.98 |
– | – | – | – | – | – |
Notes. Abundances in 12 + log (X+i/H+). Colons indicate errors larger than a factor of two.
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