Table B.1: Equivalent width of the CNO emission lines in HD 45166 obtained from the observations. References: Willis & Stickland (1983) for ultraviolet lines (1200-3300 Å), and this work for optical lines (3700-9000 Å). Key: y=line is present; $y?=\rm doubtful$ identification due to low S/N; ?=doubtful identification due to presence of a telluric line; bl=blended with other lines; n=line is definitely not present.
O N C

Term J-J $\lambda$ (Å) $W_{\lambda }$ (Å) $\lambda$ (Å) $W_{\lambda }$ (Å) $\lambda$ (Å) $W_{\lambda }$ (Å)

O III

IP(eV) 54.94

Singlets

1P⁰-1S 1-0 1247 ?

3s 1P⁰-3p 1P 1-1 5592 0.75

3p 1D-3d 1F⁰ 2-3 3962 0.29

4p 1S-5s1P⁰ 0-1 5268 0.13

4p 1D-5s 1P⁰ 4569 0.05

3s 1P⁰-3p 1D 2984 0.88?

Triplets

3P⁰-3P 1175 1.86 ?

3s 3P⁰-3p 3D 2-3 3760 1.4

1-2 3755 0.99

0-1 3757 1.1

2-2 3791 ...

1-1 3774 ...

3p 3P-3d 3D⁰ 2-3 3715 0.99

1-2 3707 0.35

1-1 3703 ...

3s 3P-3p 3D⁰ 2-3 4081 0.12

4074 ...

4d 3P⁰-3s 3D 1-2 7455 0.08

7475 ...

7482 ...

7492 ...

O IV N III

IP(eV) 77.41 47.45

2p2 2P-2p3 2Do
3/2-5/2 1344 ... 1752 ...

1/2-3/2 1339 1.82 1748 ...

3/2-3/2 1343 0.92 1751 ...

3s 2S-3p 2P⁰ 1/2-3/2 3063 ... 4097 1.66

1/2-1/2 3072 ... 4103 0.84

3s 2P⁰-3p 2D 3/2-5/2 3349 ... 4200 0.77

1/2-3/2 3348 ... 4196 0.16

3/2-3/2 3378 ... 4216 ...

3p 2P-3d 2P⁰ 3/2-3/2 2133 ... 2984 0.88

1/2-3/2 2127 ... 2979 ...

3/2-1/2 2126 ... 2977 ...

1/2-1/2 2120 ... 2973 ...

3p 2P⁰-3d 2D 3/2-5/2 3412 ... 4641 1.37

1/2-3/2 3404 ... 4634 0.75

3/2-3/2 3414 ... 4642 ?

4d 2D-5f 2F⁰ 5/2-7/2 3563 ... 4004 0.07

3/2-5/2 3560 ... 3999 ...

4f 2F⁰-5g 2G 4379 0.56

3d 2P⁰-6d 2D 8494 y

5f 2F⁰-6g 2G 8019 0.54

3s 4P⁰-3p 4D 5/2-7/2 3386 ... 4515 0.19:

1/2-3/2 3381 ... 4511 0.21

3p 4D-3d 4F⁰ 7/2-9/2 3737 ... 4867 0.20

5/2-7/2 3729 ... 4861 ...

3/2-5/2 3725 ... 4859 ...

O V N IV C III

IP(eV) 113.90 77.47 47.89

Singlets

2p 1P⁰-2p2 1D 1-2 1371 2.71 1719 4.97 2297 1.88

2p 1P⁰-2p2 1S 1-0 774 ... 955 ... 1247 y

3s 1S-3s 1P⁰ 0-1 1188 0.19 1591 ...

3s 1S-3p 1P⁰ 0-1 5114 y? 6381 0.21: 8500 y

3p 1P⁰-3d 1D 1-2 3145 ... 4058 1.11 5695 0.096

3d 1D-3s 1P⁰ 2279 ... 2982 y?

3d 1D-3d 1F⁰ 2-3 1310 0.26 1541 ...

3d 1D-5f 1F⁰ 2-3 509 ... 1297 y? 1382 ...

4p 1P⁰-5d 1D 1- 1419 0.30

4f 1F⁰-5g 1G 3-4 1708 ... 3078 ... 4187 0.127

Intercombination

2s2 1S-2p 3P⁰ 0- 1218 ... 1486 0.11 1909 n

Triplets

2p 3P⁰-2p2 3P 1-0 759 ... 923 ... 1175 1.86

759 ... 1172 ...

3s 3S-3p 3P⁰ 1-2 2781 ... 3479 ... 4647 2.38

1-1 2787 ... 3482 ... 4650 1.46

1-0 2790 ... 3484 ... 4651 0.42:

3s 3P⁰-3p 3P 2-2 2731 ... 3463 y 4666 y

2744 ... 3461 y 4673 ?

2729 ... 3475 y 4663 ?

3s 3P⁰-3p 3D 2-3 4124 ... 5204 y 6744 0.17

4120 ... 5200 y 6731 0.077:

4125 ... 5205 y? 6727 ...

3p 3P⁰-3p 3D 1055 ... 1272 0.92 1578 ...

1058 ...

1059 ...

1060 ...

1061 ...

3p 3P⁰-3d 3D 2-3 5598 n 7123 3.31 9715 ...

1-2 5580 ... 7109 1.91: 9705 ...

0-1 5573 ... 7103 0.92 9701 ...

2-2 5604 ... 7127 0.70: 9718 ...

1-1 5583 ... 7111 y 9706 ...

2-1 5607 ... 7129 ... 9719 ...

3d 3D-3d 3F⁰ 1326 0.14

3d 3D-5f 3F⁰ 1296 ...

4s 3S-4p 3P⁰ 1-2 7437 n 6220 y 7796 n

1-1 7443 n 6215 y 7780 n

1-0 7458 ... 6212 y? 7772 ...

4p 3P⁰-5d 3D 2- 1418 0.61 2036 ... 3610 ...

4d 3D-5f 3F⁰ 1507 0.37 2318 ... 3889 y?

5d 3D-6f 3F⁰ 2757 ... 7487 0.134

4f 3F⁰-5g 3G 4-5 1644 ... 2648 ... 4068 y

2647 ... 4070 y

2646 ...

5f 3F⁰-6g 3G 2707 ... 4707 y 7487 y

5g 3G-6h 3H⁰ 2942 ... 4606 0.077 8196 y

6h 3H⁰-7i 3I 4930 y 7703 y 13696 ...

N V C IV

IP(eV) 97.89 64.49

Doublets

2s 2S- 2p 2P⁰ 1/2-3/2 1239 9.0 1548 1.34

1/2-1/2 1243 ... 1551 0.55

3s 2S-3p 2P⁰ 1/2-3/2 4604 abs 5801 16.68

1/2-1/2 4620 abs 5812 9.96

4s 2S-4p 2P⁰ 1/2-3/2 11331 ... 14335 ...

1/2-1/2 11374 ... 14362 ...

5s 2S-5p 2P⁰ 1/2-3/2 22572 ... 28617 ...

1/2-1/2 22654 ... 28675 ...

Multiplets

(4-5) 1620 0.21 2530 0.26

1622 0.15

1655 ...

(5-6) 2981 ... 4658 0.42:

(5-7) 1860 ... 2907 ...

(6-7) 4945 0.103 7726 1.55

(6-8) 2998 ... 4685 bl

(7-8) 7618 ... 1908 ...

(7-9) 4520 ... 7063 y

(8-9) 10980 ... 17371 ...

(7-10) 3502 ... 5471 y

(8-10) 6478 ... 10124 ...

(9-10) 15536 ... 24278 ...

(8-11) 4943: ... 7737 y

(9-11) 8927 ... 13954 ...

(10-11) 21000 ... 32808 ...

(8-12) 4191 ... 6560 bl

(9-12) 6747 ... 10543 ...

(10-12) 11928 ... 18635 ...

(11-12) 27593 ... 43138 ...

(9-13) 5670 ... 8858 ...

(10-13) 8918 ... 13946 ...

**Table B.1:** Equivalent width of the CNO emission lines in HD 45166 obtained from the observations. References: Willis & Stickland (1983) for ultraviolet lines (1200-3300 Å), and this work for optical lines (3700-9000 Å). Key: y=*line* is present; $y?=\rm doubtful$ identification due to low S/N; ?=doubtful identification due to presence of a telluric line; bl=blended with other lines; n=line is definitely not present.
		O	N	C
Term	J-J	$\lambda$ (Å)	$W_{\lambda }$ (Å)	$\lambda$ (Å)	$W_{\lambda }$ (Å)	$\lambda$ (Å)	$W_{\lambda }$ (Å)
		O III
IP(eV)	54.94
Singlets
1P⁰-1S	1-0	1247	?
3s 1P⁰-3p 1P	1-1	5592	0.75
3p 1D-3d 1F⁰	2-3	3962	0.29
4p 1S-5s1P⁰	0-1	5268	0.13
4p 1D-5s 1P⁰		4569	0.05
3s 1P⁰-3p 1D		2984	0.88?
Triplets
3P⁰-3P		1175	1.86 ?
3s 3P⁰-3p 3D	2-3	3760	1.4
	1-2	3755	0.99
	0-1	3757	1.1
	2-2	3791	...
	1-1	3774	...
3p 3P-3d 3D⁰	2-3	3715	0.99
	1-2	3707	0.35
	1-1	3703	...
3s 3P-3p 3D⁰	2-3	4081	0.12
		4074	...
4d 3P⁰-3s 3D	1-2	7455	0.08
		7475	...
		7482	...
		7492	...
		O IV	N III
IP(eV)	77.41	47.45
2p2 2P-2p3 2Do	3/2-5/2	1344	...	1752	...
	1/2-3/2	1339	1.82	1748	...
	3/2-3/2	1343	0.92	1751	...
3s 2S-3p 2P⁰	1/2-3/2	3063	...	4097	1.66
	1/2-1/2	3072	...	4103	0.84
3s 2P⁰-3p 2D	3/2-5/2	3349	...	4200	0.77
	1/2-3/2	3348	...	4196	0.16
	3/2-3/2	3378	...	4216	...
3p 2P-3d 2P⁰	3/2-3/2	2133	...	2984	0.88
	1/2-3/2	2127	...	2979	...
	3/2-1/2	2126	...	2977	...
	1/2-1/2	2120	...	2973	...
3p 2P⁰-3d 2D	3/2-5/2	3412	...	4641	1.37
	1/2-3/2	3404	...	4634	0.75
	3/2-3/2	3414	...	4642	?
4d 2D-5f 2F⁰	5/2-7/2	3563	...	4004	0.07
	3/2-5/2	3560	...	3999	...
4f 2F⁰-5g 2G				4379	0.56
3d 2P⁰-6d 2D				8494	y
5f 2F⁰-6g 2G				8019	0.54
3s 4P⁰-3p 4D	5/2-7/2	3386	...	4515	0.19:
	1/2-3/2	3381	...	4511	0.21
3p 4D-3d 4F⁰	7/2-9/2	3737	...	4867	0.20
	5/2-7/2	3729	...	4861	...
	3/2-5/2	3725	...	4859	...
		O V	N IV	C III
IP(eV)	113.90	77.47	47.89
Singlets
2p 1P⁰-2p2 1D	1-2	1371	2.71	1719	4.97	2297	1.88
2p 1P⁰-2p2 1S	1-0	774	...	955	...	1247	y
3s 1S-3s 1P⁰	0-1			1188	0.19	1591	...
3s 1S-3p 1P⁰	0-1	5114	y?	6381	0.21:	8500	y
3p 1P⁰-3d 1D	1-2	3145	...	4058	1.11	5695	0.096
3d 1D-3s 1P⁰				2279	...	2982	y?
3d 1D-3d 1F⁰	2-3			1310	0.26	1541	...
3d 1D-5f 1F⁰	2-3	509	...	1297	y?	1382	...
4p 1P⁰-5d 1D	1-	1419	0.30
4f 1F⁰-5g 1G	3-4	1708	...	3078	...	4187	0.127
Intercombination
2s2 1S-2p 3P⁰	0-	1218	...	1486	0.11	1909	n
Triplets
2p 3P⁰-2p2 3P	1-0	759	...	923	...	1175	1.86
		759	...			1172	...
3s 3S-3p 3P⁰	1-2	2781	...	3479	...	4647	2.38
	1-1	2787	...	3482	...	4650	1.46
	1-0	2790	...	3484	...	4651	0.42:
3s 3P⁰-3p 3P	2-2	2731	...	3463	y	4666	y
		2744	...	3461	y	4673	?
		2729	...	3475	y	4663	?
3s 3P⁰-3p 3D	2-3	4124	...	5204	y	6744	0.17
		4120	...	5200	y	6731	0.077:
		4125	...	5205	y?	6727	...
3p 3P⁰-3p 3D		1055	...	1272	0.92	1578	...
		1058	...
		1059	...
		1060	...
		1061	...
3p 3P⁰-3d 3D	2-3	5598	n	7123	3.31	9715	...
	1-2	5580	...	7109	1.91:	9705	...
	0-1	5573	...	7103	0.92	9701	...
	2-2	5604	...	7127	0.70:	9718	...
	1-1	5583	...	7111	y	9706	...
	2-1	5607	...	7129	...	9719	...
3d 3D-3d 3F⁰				1326	0.14
3d 3D-5f 3F⁰						1296	...
4s 3S-4p 3P⁰	1-2	7437	n	6220	y	7796	n
	1-1	7443	n	6215	y	7780	n
	1-0	7458	...	6212	y?	7772	...
4p 3P⁰-5d 3D	2-	1418	0.61	2036	...	3610	...
4d 3D-5f 3F⁰		1507	0.37	2318	...	3889	y?
5d 3D-6f 3F⁰		2757	...			7487	0.134
4f 3F⁰-5g 3G	4-5	1644	...	2648	...	4068	y
				2647	...	4070	y
				2646	...
5f 3F⁰-6g 3G		2707	...	4707	y	7487	y
5g 3G-6h 3H⁰		2942	...	4606	0.077	8196	y
6h 3H⁰-7i 3I		4930	y	7703	y	13696	...
			N V	C IV
IP(eV)		97.89	64.49
Doublets
2s 2S- 2p 2P⁰	1/2-3/2			1239	9.0	1548	1.34
	1/2-1/2			1243	...	1551	0.55
3s 2S-3p 2P⁰	1/2-3/2			4604	abs	5801	16.68
	1/2-1/2			4620	abs	5812	9.96
4s 2S-4p 2P⁰	1/2-3/2			11331	...	14335	...
	1/2-1/2			11374	...	14362	...
5s 2S-5p 2P⁰	1/2-3/2			22572	...	28617	...
	1/2-1/2			22654	...	28675	...
Multiplets
(4-5)				1620	0.21	2530	0.26
				1622	0.15
				1655	...
(5-6)				2981	...	4658	0.42:
(5-7)				1860	...	2907	...
(6-7)				4945	0.103	7726	1.55
(6-8)				2998	...	4685	bl
(7-8)				7618	...	1908	...
(7-9)				4520	...	7063	y
(8-9)				10980	...	17371	...
(7-10)				3502	...	5471	y
(8-10)				6478	...	10124	...
(9-10)				15536	...	24278	...
(8-11)				4943:	...	7737	y
(9-11)				8927	...	13954	...
(10-11)				21000	...	32808	...
(8-12)				4191	...	6560	bl
(9-12)				6747	...	10543	...
(10-12)				11928	...	18635	...
(11-12)				27593	...	43138	...
(9-13)				5670	...	8858	...
(10-13)				8918	...	13946	...

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