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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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