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Table 2

Diagnostic nitrogen lines in the optical (and adjacent) spectrum of early B- and O-type stars, together with potential blends.

Ion Transition Multiplet Line Wavelength (Å) Blends Used

N ii N29–N216 12 1 3994.99 +
N211–N219 15 2 4447.03 O iiλ4446.81, 4447.67, 4448.19, O iiiλ4447.79 +
N28–N215 5 3 4601.47 O iiλ4602.13, 4603.23, N iiiλ4604.18 +
N28–N215 5 4 4607.16 O iiλ4609.44, 4610.20, N iiiλ4605.16, Ne iiλ4606.70 +
N28–N215 5 5 4621.39 O iiλ4621.27, N iiiλ4621.04, 4623.05, Si iiλ4621.72 +
N28–N215 5 6 4630.54 O iiiλ4630.77, N iiiλ4630.61, Si ivλ4631.24 +
N28–N215 5 7 4643.09 O iiλ4641.81, 4643.89, N iiiλ4641.85
N212–N218 19 8 5005.15 O iiiλ5006.84
N214–N221 24 9 5007.33 O iiiλ5006.84
N28–N214 4 10 5045.10 N iiλ5046.53
N28–N212 3 11 5666.63 C iiλ5662.47
N28–N212 3 12 5676.01 N iiλ5679.55
N28–N212 3 13 5679.55 N iiλ5676.01
N28–N212 3 14 5710.77 Si iiλ5707.20
N215–N220 28 15 5941.65 N iiλ5940.24, N iiiλ5943.44

N iii N320-N333 17 1 4003.58 O iiλ4007.46 +
N38–N310 1 2 4097.33 O iiλ4097.26, 4098.24, Hδλ4101.74 +
N313–N322 6 3 4195.76 O iiλ4192.52, 4196.26, Si iiiλ4195.59, He iiλ4200.00 +
N313–N322 6 4 4200.07 He iiλ4200.00
N321–N334 18 5 4379.11 O iiλ4378.03, 4378.43, C iiiλ4379.47, N iiλ4379.59 +
N312–N316 3 6 4510.88 N iiiλ4510.92, Ne iiλ4511.42 +
N312–N316 3 7 4514.86 O iiiλ4513.83, Ne iiλ4514.88, C iiiλ4515.81, 4516.77 +
N312–N316 3 8 4518.14 Ne iiλ4518.14, O iiiλ4519.62 +
N310–N311 2 9 4634.14 Si ivλ4631.24, O ivλ4632 +
N310–N311 2 10 4640.64 O iiλ4638.86, Si iiiλ4638.28 +
N310–N311 2 11 4641.85 O iiλ4641.81, 4643.39, N iiλ4643.08 +
N322–N330 21 12 5320.82 O iiλ5322.53
N322–N330 21 13 5327.18
N319–N325 14 14 6445.34
N319–N325 14 15 6450.79 C ivλ6449.90
N319–N325 14 16 6454.08 O iiλ6457.05, N iiλ6457.68
N319–N325 14 17 6467.02

N iv N47–N410 1 1 3478.71 +
N47–N410 1 2 3482.99 +
N47–N410 1 3 3484.96 +
N49–N412 3 4 4057.76 C iiiλ4056.06, 4059.56 +
N48–N49 2 5 6380.77 O iiiλ6378.34, 6383.30, DIBs λλ 6376.08,6379.32 +
N413–N416 5 6 5200.41 O ivλ5198.22
N413–N416 5 7 5204.28 N ivλ5205.15
N413–N416 5 8 5205.15 N ivλ5204.28, O iiλ5206.65
N410–N411 4 9 7103.24 +
N410–N411 4 10 7109.35 +
N410–N411 4 11 7111.28 +
N410–N411 4 12 7122.98 +
N410–N411 4 13 7127.25 +
N410–N411 4 14 7129.18 +

N v N53–N54 1 1 4603.73 N iiiλ4604.18, 4605.16, N ivλ4606.33 +
N53–N54 1 2 4619.98 Si iiiλ4619.66, N iiiλ4621.04, 4623.05 +
N518–N525 9 3 4943.17 O ivλ4941.29
N519–N526 10 4 4943.97 O ivλ4941.29
N520–N527 10.01 5 4945.29 - -

Notes. Line numbers for N ii, N iv and N v refer to important transitions as indicated in Figs. A.1 − A.3, respectively, and for N iii to the corresponding Fig. B.1 in Paper I. Multiplet numbers for N ii/N iii are from Moore (1975), and for N iv/N v from Moore (1971). Lines used within the present work are labeled by “+”. Lower and upper levels of the transitions are denoted by a combination of ion and level number according to Tables A.1 − A.3, e.g., “N29” means level #9 of N ii.

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