Table 1
Characteristics of He I emission lines detected in this work.
| λrest, vac (Å) |
Ek (eV) |
Transition a |
Akib (106 s−1) |
Fitc | λobs, vac (Å) |
FWHM (km s−1) |
Velocity (km s−1) |
Flux (10−17 erg s−1 cm−2) |
S/N (σ) |
|---|---|---|---|---|---|---|---|---|---|
| 3889.75 | 23.01 | T 3p-2s | 9.5 | s | 3889.75 | 7.2 ± 0.8 | -0.2 ± 0.3 | 3.0 ± 3.6 | 6 |
| 4027.33 | 24.04 | T 5d-2p | 4.8 | s d ,NC d, BC | 4027.40 4027.33 4027.45 |
23.5 ± 1.0 13.0 ± 2.2 26.4 ± 1.7 |
5.4 ± 0.3 0.1 ± 0.6 9.2 ± 1.6 |
7.9 ± 2.5 8.3 ± 2.5 |
9 10 |
| 4472.73 | 23.74 | T 4d-2p | 24.6 |
s d, NC d, BC |
4472.78 4472.74 4472.89 |
20.1 ± 0.5 14.4 ± 2.4 22.0 ± 6.3 |
3.7 ± 0.2 0.3 ± 1.1 10.4 ± 7.0 |
19.5 ± 3.2 20.9 ± 3.2 |
18 20 |
| 4923.31 | 23.74 | S 4d-2p | 19.9 |
s d, NC d, BC |
4923.36 4923.34 4923.47 |
16.2 ± 0.4 11.8 ± 0.5 33.3 ± 2.1 |
2.9 ± 0.2 1.9 ± 0.2 9.8 ± 1.2 |
6.1 ± 1.6 7.5 ± 1.6 |
13 14 |
| 5017.08 | 23.09 | S 3p-2s | 13.4 | s | 5017.10 | 13.4 ± 0.3 | 0.9 ± 0.1 | 6.5 ± 1.7 | 20 |
| 5877.25 | 23.07 | T 3d-2p | 53.0 |
s d, NC d, BC |
5877.32 5877.25 5877.56 |
23.5 ± 0.3 16.0 ± 0.2 23.4 ± 0.6 |
3.7 ± 0.2 -0.2 ± 0.1 16.0 ± 0.5 |
61.6 ± 1.5 68.4 ± 1.5 |
132 147 |
| 6679.99 | 23.07 | S 3d-2p | 63.7 | s | 6680.03 | 17.4 ± 0.1 | 1.5 ± 0.0 | 28.6 ± 1.8 | 77 |
Notes. (a)Triplet (S = 1) and singlet (S = 0) line transitions of He I, denoted respectively by T and S, are identified from Del Zanna et al. (2020). (b)Aki denotes the Einstein coefficient for the transition. (c)s refers to a single Gaussian fit and d refers to a double Gaussian fit. Line characteristics for the narrow and broad components for the latter are indicated as NC and BC respectively.
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