On helium-dominated stellar evolution: the mysterious role of the O(He)-type stars

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Table 1

Statistics of the model atoms used in our TMAP calculations.

	T_eff

	>110 kK			≤110 kK

ion	NLTE	LTE	lines	NLTE	LTE	lines

H i	10	6	45	10	6	45
H ii	1	−	−	1	−	−
He i	5	98	3	5	98	3
He ii	14	18	91	14	18	91
He iii	1	−	−	1	−	−
C iii	13	54	32	13	54	32
C iv	14	44	35	14	44	35
C v	1	0	0	1	0	0
N iii	1	65	0	1	65	0
N iv	16	78	30	16	78	30
N v	14	48	35	14	48	35
N vi	1	0	0	1	0	0
O iv	18	76	39	18	76	39
O v	17	109	35	17	109	35
O vi	14	48	33	14	48	33
O vii	1	0	0	1	0	0
F v	1	10	0	1	10	0
F vi	6	6	0	6	6	0
F vii	2	4	0	2	4	0
F viii	1	0	0	1	0	0
Ne iv	0	0	0	2	39	0
Ne v	14	80	18	14	80	18
Ne vi	14	17	30	14	17	30
Ne vii	15	94	27	15	94	27
Ne viii	14	90	35	1	0	0
Ne ix	1	0	0	1	0	0
Si iv	12	11	24	12	11	24
Si v	25	0	59	25	0	59
Si vi	45	195	193	45	195	193
Si vii	1	0	0	1	0	0
P iv	15	36	9	15	36	9
P v	18	7	12	18	7	12
P vi	1	0	0	1	0	0
S v	23	87	47	23	87	47
S vi	25	12	25	25	12	25
S vii	1	0	0	1	0	0
Ar v				1	359	0
Ar vi	1	183	0	14	170	16
Ar vii	40	112	130	40	112	130
Ar viii	13	28	24	13	28	24
Ar ix	1	0	0	1	0	0

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