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 | – | |
|
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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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