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Table 1.
Log of the spectroscopic observations.
| Date | JD (2 400 000+) | Telescope | Wavelength | EW(Hα) | Wavelength | EW(Hβ) |
|---|---|---|---|---|---|---|
| range (Å) | (Å) | range (Å) | (Å) | |||
| 04-10-2017 | 58031.42 | SKO | 5460–6740 | −11.0 ± 0.3 | 3880–5315 | −1.2 ± 0.2 |
| 13-10-2017 | 58040.37 | SKO | 5460–7380 | −10.2 ± 0.3 | 3690–5580 | −1.3 ± 0.2 |
| 15-10-2017 | 58042.36 | SKO | 5460–7380 | −9.8 ± 0.3 | 3690–5580 | −1.1 ± 0.2 |
| 30-10-2017 | 58057.49 | WHT | 6450–7260 | −11.2 ± 0.6 | 3830–4695 | – |
| 22-11-2017 | 58080.26 | SKO | 5450–7370 | −11.1 ± 0.3 | – | – |
| 15-07-2018 | 58315.58 | SKO | 5465–7375 | −10.8 ± 0.4 | – | – |
| 22-08-2018 | 58353.56 | SKO | 5400–7300 | −10.1 ± 0.3 | – | – |
| 25-08-2018 | 58356.54 | SKO | 5400–7300 | −10.3 ± 0.3 | – | – |
| 19-09-2018 | 58381.42 | SKO | 5400–7300 | −9.4 ± 0.2 | – | – |
| 08-10-2018 | 58400.51 | SKO | 5400–7300 | −9.1 ± 0.2 | – | – |
| 19-08-2019 | 58715.59 | SKO | 5375–7285 | −4.9 ± 0.2 | – | – |
| 09-09-2019 | 58736.53 | SKO | 5375–7285 | −5.8 ± 0.3 | – | – |
| 09-02-2020 | 58889.40 | WHT | 6355–7255 | −7.5 ± 0.4 | 3850–4675 | – |
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