Analysis of chemical abundances in planetary nebulae with [WC] central stars - II. Chemical abundances and the abundance discrepancy factor

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Table 1

He⁺ and He⁺⁺ abundances^a.

	Cn 1-5	Hb 4	He 2-86	M 1-25	M 1-30	M 1-32

Lines	12	11	12	16	16	13
τ ₃₈₈₉	6.23 ± 1.09	13.51 ± 2.78	17.67 ± 1.62	13.22 ± 2.04	12.93:	5.51 ± 2.35
χ ²	6.9	10.2	33.4	9.3	15.3	10.5
He⁺/H⁺^b	1380 ± 28	934 ± 43	1226 ± 24	1236 ± 35	1306 ± 35	1257 ± 47

He⁺⁺/H⁺	–	203 ± 6	–	0.39 ± 0.16	–	3.75 ± 0.44

	M 1-61	M 3-15	NGC 5189	NGC 6369	PC 14	Pe 1-1

Lines	16	12	13	14	13	14
τ ₃₈₈₉	16.50 ± 1.87	14.21 ± 2.28	3.20 ± 0.72	8.48 ± 1.83	5.88 ± 1.41	10.50 ± 1.67
χ ²	28.3	17.0	7.9	9.3	6.0	7.3
He⁺/H⁺^b	1086 ± 32	1055 ± 35	847 ± 21	1033 ± 32	1036 ± 31	1054 ± 34

He⁺⁺/H⁺	–	–	376 ± 6	3.96 ± 0.36	41.5 ± 1.2	0.47 ± 0.19

Notes.

^(a)

In units of 10^-4. Errors correspond to the uncertainties in line flux measurements.

^(b)

It includes all uncertainties related to line intensities, n_e, τ₃₈₈₉, and t².

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