Abundances in planetary nebulae: NGC 1535, NGC 6629, He2-108, and Tc1

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Table 2

Visual spectrum of NGC 1535.

λ	Ion	Intensities^†				Average

(Å)		(1)	(2)	(3)	(4)	Intens.

3727^*	[O ii]	4.1	7.1	8.41	9.37	8.41
3869	[Ne iii]	90	95.8	97	116	101
4267	C ii	0.4^:	0.34	1.03	0.36	0.34
4363	[O iii]	13.3	12.5	11	12.6	12.6
4686	He ii	27	14.2	18.3	17	17.5
4711	[Ar iv]	4.5	4.2	5.4	4.5	4.5
4740	[Ar iv]	3.8	3.2	3.8	3.36	3.4
4861	Hβ	100	100	100	100	100
5007	[O iii]	1220	1210	1180	1190	1200
5517	[Cl iii]		0.242	0.264		0.25
5538	[Cl iii]		0.177	0.175		0.175
5755	[N ii]		0.1^:	0.62		0.1^:
5876	He i	10.2	12.6	11.8	12.6	12.2
6312	[S iii]		0.303		0.28	0.30
6584	[N ii]	1.8	1.62	0.25^:	0.85	1.6^:
6717	[S ii]		0.0627			0.0627
6731	[S ii]		0.114			0.114
7135	[Ar iii]	6.0	6.42	5.3		6.3
7263	[Ar iv]		0.217			0.217
8045	[Cl iv]		0.512	0.53		0.52
9532	[S iii]		6.75			6.75
C(Hβ)		0.2	0.07	0.11	0.01

Notes.

^†

References: (1) Barker (1989); (2) Milingo et al. (2010); (3) Aller & Czyzak (1979); (4) Krabbe & Copetti (2006).

^(:)

Indicates uncertain values.

^(∗)

This is a blend of λ3726 and λ3729 lines. Only Aller & Czyzak are able to resolve this doublet: 3726 = 5.4, 3729 = 3.01.

^(C)

is the extinction used by the author.

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