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Table 2.

Journal of spectroscopic observations with information about time (UT, HJD, phase) and exposure times.

Date [UT] (⬧) HJD (⬧) Phase ( ⋆ ) Exp. t. He II Hβ [O III] [Ca VII] He I [Fe VII] Hα He I O VI He I
λ4685.7 λ5006.9 λ5618.8 λ5875.6 λ6087 λ6678.2 λ6825 λ7065.2
yyyy-mm-dd hh:mm:ss −2 450 000 [s] [Å] [Å] [Å] [Å] [Å] [Å] [Å] [Å] [Å] [Å]
2005-02-01 06:16:51 3402.762 0.272 2 × 1800 9 32 11 0 9 0 230 6 0 7
2005-05-16 02:04:17 3506.591 0.385 2 × 1800 14 30 12 0 9 0 261 9 0 9
2017-04-17 19:48:06 7861.329 0.129 3 × 1200 98 74 5 3 8 4 202 4 13 5
2017-05-10 23:01:42 7884.464 0.154 3 × 400 191: 94: 3 4 9 4 265 4 14 5
2017-06-12 20:53:02 7917.373 0.190 3 × 400 nc nc 0 2 5 5 256 4 11 4
2017-07-06 19:55:52 7941.333 0.216 3 × 400 nc nc nc 2 7 3 229 3 7 4
2017-07-30 18:31:00 7965.272 0.242 3 × 400 nc nc nc 3 14 3 246 3 8 4
2018-02-05 00:40:20 8154.528 0.448 3 × 1200 111 150 nc 4 26 4 549 10 19 16
2018-03-04 22:28:27 8182.438 0.479 3 × 600 nc nc 0 5 33 5 587 12 24 16
2019-02-15 23:18:25 8530.472 0.858 2340 0 8 1 0 2 0 107 1 0 1
2019-03-30 02:00:56 8572.587 0.904 2200 0 9 0 0 0 0 113 0 0 0
2019-05-01 23:58:17 8605.503 0.940 2570 0 7 0 0 0 0 109 0 0 0
2019-06-08 21:06:40 8643.383 0.981 2950 0 13 0 0 3 0 175 2 0 2
2020-01-28 00:36:18 8876.525 0.235 2750 15 26 8 0 11 0 218 8 0 9
2020-05-10 22:47:55 8980.454 0.348 2750 14 32 10 0 11 0 228 8 0 10
2020-07-01 19:39:40 9032.322 0.404 2750 13 39 10 0 12 0 243 9 0 10
2021-02-04 00:35:29 9249.525 0.641 2900 10 32 7 0 7 0 189 7 0 7
2021-03-26 21:21:13 9300.393 0.697 2900 14 53 10 0 11 0 268 9 0 9
2021-05-02 18:17:17 9337.266 0.737 2600 10 43 9 0 9 0 245 7 0 9
2021-07-25 18:15:44 9421.262 0.828 2600 19 54 13 0 15 0 332 12 0 14

Notes. The right-hand columns separated by a vertical line show the measured equivalent widths (EWs) of emission lines. The errors are of the order of 1 Å. The sign ‘nc’ means that EW was not measured, although the line was visible because of a problem with estimating the continuum level due to low S/N. A colon designates the measurements that can be burdened with large uncertainty and are difficult to estimate. (⬧)Time at mid of exposure. ( ⋆ )Phase according to the ephemeris: HJDT0 = 2458661 + 918 × E (Table 3).

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