Table 1
Observation log showing nights of observation of AD Leo.
| Obs. date | Start–end time (UTC) | Obs (h) | Exposure time (s) | Number of spectra | Flare energy (1031erg) | |||
|---|---|---|---|---|---|---|---|---|
| Hα | Hβ | He I 5876 | ||||||
| 2016-11-19 | 01:29–03:47 | 2.33 | 600 | 14 | – | – | – | |
| 2016-11-20 | 00:01–00:32 | 0.5 | 600 | 3 | – | – | – | |
| 2016-12-09 | 01:17–01:47 | 0.5 | 600 | 3 | – | – | – | |
| 2016-12-16 | 23:25–01:30 | 2 | 600 | 12 | – | – | – | |
| 2016-12-21 | 01:23–04:55 | 3.5 | 600 | 21 | – | – | – | |
| 2017-02-03 | 23:54–00:15 | 0.33 | 600 | 2 | – | – | – | |
| 2017-02-04 | 22:19–00:03 | 1.83 | 600 | 11 | – | – | – | |
| 2017-02-13 | 01:11–04:21 | 3.17 | 600 | 19 | – | – | – | |
| 2017-02-14(†) | 22:37–04:44 | 6 | 600 | 36 | 12.05 ± 0.03 | 9.495 ± 0.077 | 0.553 ± 0.004 | |
| 2017-02-15 | 22:58–04:26 | 5.33 | 600 | 32 | – | – | – | |
| 2017-03-10 | 20:41–21:01 | 0.33 | 600 | 2 | – | – | – | |
| 2017-03-10 | 18:51–01:51 | 6.83 | 600 | 41 | – | – | – | |
| 2017-03-11 | 18:14–03:15 | 8.67 | 600 | 52 | – | – | – | |
| 2017-03-12 | 18:25–02:24 | 3.83 | 600 | 23 | – | – | – | |
| 2017-04-15 | 21:41–23:15 | 1.67 | 600 | 10 | – | – | – | |
| 2017-05-03 | 20:55–21:25 | 0.5 | 600 | 3 | – | – | – | |
| 2017-05-06 | 19:33–22:21 | 2.83 | 600 | 17 | – | – | – | |
| 2017-05-07 | 19:17–20:20 | 1.17 | 600 | 7 | – | – | – | |
| 2017-05-09 | 20:55–21:26 | 0.5 | 600 | 3 | – | – | – | |
| 2017-05-10 | 20:16–21:19 | 1.17 | 600 | 7 | – | – | – | |
| 2017-05-15(†) | 20:31–21:47 | 1.25 | 600 | 8 | 1.593 ± 0.005 | - | - | |
| 2017-12-24 | 02:25–03:07 | 0.5 | 600 | 3 | – | – | – | |
| 2017-12-25 | 23:53–05:07 | 3.67 | 600 | 22 | – | – | – | |
| 2017-12-26 | 00:37–01:40 | 1.33 | 600 | 7 | – | – | – | |
| 2017-12-28 | 22:53–00:06 | 1.25 | 600 | 8 | – | – | – | |
| 2018-01-05 | 01:28–03:45 | 2.33 | 600 | 14 | – | – | – | |
| 2018-02-12 | 19:25–23:23 | 2.67 | 600 | 16 | – | – | – | |
| 2018-02-13(†) | 18:29–04:48 | 10 | 600 | 60 | 3.155 ± 0.033 | 1.154 ± 0.012 | 0.154 ± 0.002 | |
| 2018-02-14 | 18:39–03:04 | 8.17 | 600 | 49 | 5.854 ± 0.031 | 2.195 ± 0.036 | 0.443 ± 0.007 | |
| 21.2 ± 0.4 | 8.323 ± 0.319 | 1.998 ± 0.077 | ||||||
| 2018-02-16(†) | 18:26–03:50 | 7 | 600 | 42 | 19.472 ± 0.079 | 5.11 ± 0.06 | 0.428 ± 0.002 | |
| 2018-02-18 | 18:25–01:03 | 5.83 | 600 | 35 | 11.909 ± 0.082 | 3.715 ± 0.069 | 0.391 ± 0.003 | |
| 2018-02-26 | 21:04–04:17 | 7 | 600 | 42 | 14.599 ± 0.061 | 3.081 ± 0.021 | 0.499 ± 0.004 | |
| 2018-02-27 | 18:22–04:05 | 9.33 | 600 | 56 | – | – | – | |
| 2018-02-28 | 18:19–04:20 | 9.67 | 600 | 58 | – | – | – | |
| 2018-03-01 | 18:14–04:00 | 9.33 | 600 | 56 | – | – | – | |
| 2018-03-04 | 00:15–02:21 | 2.17 | 600 | 13 | – | – | – | |
| 2018-03-05 | 20:35–02:47 | 5.67 | 600 | 34 | 8.406 ± 0.135 | 5.031 ± 0.255 | 0.536 ± 0.013 | |
| 2018-03-08 | 23:03–03:46 | 3.5 | 600 | 21 | – | – | – | |
| 2018-03-24 | 18:35–02:16 | 6.92 | 300 | 83 | – | – | – | |
| 2018-03-29 | 19:47–01:36 | 4.58 | 300 | 55 | – | – | – | |
| 2018-04-23 | 19:34–23:21 | 3.5 | 300 | 42 | – | – | – | |
| 2018-04-27(†) | 19:43–22:22 | 2.5 | 300 | 30 | 1.913 ± 0.022 | 0.691 ± 0.035 | 0.069 ± 0.004 | |
| 2018-04-29 | 19:42–22:21 | 2.5 | 300 | 30 | – | – | – | |
| 2018-05-01 | 19:58–22:37 | 2.5 | 300 | 30 | – | – | – | |
| 2018-05-04 | 19:56–22:35 | 2.5 | 300 | 30 | – | – | – | |
| 2018-05-05 | 19:59–22:11 | 2.08 | 300 | 25 | – | – | – | |
| 2018-05-07 | 19:52–22:31 | 2.5 | 300 | 30 | – | – | – | |
| 2019-02-13 | 23:28–04:31 | 4.83 | 300 | 58 | – | – | – | |
| 2019-02-14 | 19:12–04:38 | 8.67 | 300 | 104 | 8.518 ± 0.025 | 2.234 ± 0.013 | 0.524 ± 0.002 | |
| 2019-02-15 | 19:31–04:53 | 8.67 | 300 | 104 | – | – | – | |
| 2019-02-16 | 19:22–04:38 | 8.58 | 300 | 103 | 4.505 ± 0.041 | 1.12 ± 0.01 | 0.123 ± 0.001 | |
| 3.19 ± 0.01 | 0.84 ± 0.01 | 0.099 ± 0.0005 | ||||||
| 3.860 ± 0.023 | 8.61 ± 0.01 | 0.126 ± 0.001 | ||||||
| 5.531 ± 0.019 | 1.364 ± 0.012 | 0.192 ± 0.0008 | ||||||
| 2019-02-17 (†) | 19:23–04:18 | 8.33 | 300 | 100 | 6.628 ± 0.039 | 1.97 ± 0.02 | 0.300 ± 0.003 | |
| 2.884 ± 0.019 | 0.669 ± 0.008 | 0.100 ± 0.0003 | ||||||
| 2019-02-18 | 20:31–04:31 | 7 | 300 | 84 | 15.479 ± 0.012 | 3.045 ± 0.049 | 0.408 ± 0.002 | |
| 2019-02-23 | 20:35–04:22 | 7.08 | 300 | 85 | 5.939 ± 0.017 | 1.385 ± 0.008 | 0.466 ± 0.002 | |
| 5.295 ± 0.032 | 1.235 ± 0.018 | 0.419 ± 0.005 | ||||||
| 2019-02-24 (†) | 20:5 04:36 | 7.17 | 300 | 86 | 5.488±, 0.023 | 1.582 ± 0.013 | 0.145 ± 0.0009 | |
| 11.083 ± 0.048 | 2.636 ± 0.043 | 0.292 ± 0.002 | ||||||
| 2019-02-25 | 20:39–02:12 | 5.08 | 300 | 61 | – | – | – | |
Notes. The number of hours per night and the corresponding number of spectra obtained are shown in Cols. 3 and 5, respectively. Columns 6–8 correspond to the estimated energies for the flares observed in Hα, Hβ, and He I 5876. (†) indicates nights in which the value of the energy is a lower limit as only the impulsive phase or part of the gradual phase was observed.
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