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Table 1
Parameters of the models of PN H 2-18 obtained with different codes compared with observed values.
Modelled | Observed(a) | |||
---|---|---|---|---|
2014(b) | 2016(c) | 2024 | ||
Model version | Sphere | Ellipsoid | 3D | |
ion. mass [M⊙] | 0.27 | 0.051 | 0.096 | |
kin. age [k yr] | 1.67 | 1.28 | 2.4 | |
Tbb [kK] | 51 | 52 | 62 | |
L/L⊙ | 67 000 | 1700 | 5000 | |
log F (Hβ) | −11.5 | −11.6 | −11.5 | −11.5 |
He II 468 nm | 0.078 | 0.058 | 0.05 | |
[N II] 658 nm | 0.0026 | 0.07 | 0.097 | 0.078 |
[O I] 630 nm | 5×10−8 | 8×10−5 | 0.002 | 0.01 |
[O II] 372 nm | 0.005 | 0.07 | 0.13 | 0.16 |
[O III] 500 nm | 7.8 | 5.24 | 10.6 | 13.1 |
[Ne III] 386 nm | 0.70 | 0.57 | 0.999 | |
[S II] 673 nm | 5×10−6 | 0.013 | 0.018 | |
[S III 631 nm | 0.0002 | 0.009 | 0.01 | |
[Cl III] 551 nm | 0.007 | 0.081 | 0.0036 | |
[Ar IV] 471 nm | 0.047 | 0.031 | 0.027 |
Notes. The line intensities are on the scale Hβ=1. (a) Dereddened line intensities from Górny et al. (2009), (b)from Gesicki et al. (2014),(c)from Gesicki et al. (2016).
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