Morphokinematical study of the planetary nebula Me2-1: Unveiling its point-symmetric and unusual physical structure

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Table 3

Intrinsic emission line intensities in Me 2-1 (I(Hβ)=100.0) and derived physical parameters for the nebula.

Emission line	f _λ	I(λ)
He II 4339^(a)	0.157	2.0 ± 0.1
Hγ 4340	0.157	44.4 ± 0.4
[O III] 4363	0.149	21.1 ± 0.3
He I 4471	0.115	1.2 ± 0.2
He II 4540	0.094	3.4 ± 0.2
N III 4640	0.063	2.3 ± 0.2
He II 4686	0.050	84.4 ± 0.4
[Ar IV] 4711	0.042	7.9 ± 0.2
[Ne IV] 4724	0.039	1.9 ± 0.1
[Ar IV] 4740	0.034	6.4 ± 0.2
He II 4859^(a)	0.000	4.2 ± 0.1
Hβ 4861	0.000	100.0 ± 0.4
[O III] 4959	−0.026	446.2 ± 1.4
[O III] 5007	−0.038	1320.6 ± 4.0
He II 5411	−0.126	7.1 ± 0.1
[Cl III] 5517	−0.145	0.5 ± 0.1
[Cl III]5537	−0.149	0.5 ± 0.1
[N II] 5755	−0.185	0.3 ± 0.1
C IV 5806	−0.193	0.2 ± 0.1
He I 5876	−0.203	4.0 ± 0.1
[O I] 6300	−0.263	1.7 ± 0.1
[S III] 6312	−0.264	2.1 ± 0.1
[O I] 6363	−0.271	0.6 ± 0.1
He II 6407	−0.277	0.4 ± 0.1
[Ar V] 6435	−0.281	1.1 ± 0.1
He II 6527	−0.293	0.5 ± 0.1
[N II] 6548	−0.296	3.7 ± 0.1
He II 6560^(a)	−0.298	11.4 ± 0.2
Hα 6563	−0.298	281.5 ± 1.2
[N II] 6583	−0.300	12.1 ± 0.1
He I 6678	−0.313	1.9 ± 0.1
[S II] 6716	−0.318	2.3 ± 0.1
[S II] 6731	−0.320	2.8 ± 0.1
He II 6891	−0.341	0.5 ± 0.1
[Ar V] 7006	−0.356	2.3 ± 0.1
He I 7065	−0.364	1.3 ± 0.1
[Ar III] 7136	−0.374	10.2 ± 0.1
He II 7178	−0.379	1.2 ± 0.1
[Ar IV] 7236	−0.387	0.3 ± 0.1
[Ar IV] 7264	−0.391	0.4 ± 0.1
He I 7281	−0.393	0.3 ± 0.1
[O II] 7320	−0.398	1.9 ± 0.1
[O II] 7330	−0.400	1.8 ± 0.1

c(Hβ)		0.15 ± 0.01
log F(Hβ)	(erg cm⁻² s⁻¹)	−11.64 ± 0.02

T_e([N II])	(K)	13 880 ± 1540
T_e([O III])	(K)	13 900 ± 120
N_e([S II])	(cm⁻³)	1575 ± 345
N_e([Cl III])	(cm⁻³)	3260 ± 2545
N_e([Ar IV])	(cm⁻³)	1750 ± 640

Notes. ^(a) The He II Pickering emission lines are not observed because they are blended with the corresponding Balmer line. The listed (predicted) intensities have been obtained from the theoretical intensity ratio of the Pickering lines with respect to that of He II 4686 (see text).

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