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Table 2
Equivalent widths (EWs; in Å) of absorption lines used for spectral classification of bow-shock-producing stars 1, 2 and 4.
| Star | Si iv λ4089 | He i λ4143 | He i λ4471 | He ii λ4541 | He i λ4922 | He ii λ5411 |
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| 1 | 0.62 ± 0.35 | 0.30 ± 0.15 | 0.90 ± 0.12 | 0.75 ± 0.09 | 0.58 ± 0.08 | 1.07 ± 0.05 |
| 2 | – | – | – | – | 0.15 ± 0.14 | 1.07 ± 0.25 |
| 4 | 0.53 ± 0.34 | 0.14 ± 0.06 | 0.70 ± 0.12 | 1.00 ± 0.12 | 0.34 ± 0.13 | 1.15 ± 0.05 |
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