Table 1
Summary of observations.
| Object | Hα | Obs. date | Prog. ID | DITb | No. of | field | Mean |  |
Mean |
|---|---|---|---|---|---|---|---|---|---|
| Filtera | (dd.mm.yyyy) | (s) | DITs | rotation (°) | airmass | (ms) | seeingd (as) | ||
| HD142527 | B_Ha | 31.03.2016 | 096.C-0248(B) | 30 | 70 | 47.8 | 1.06 | 2.7 ± 0.2 | 0.71 ± 0.06 |
| N_Ha | 31.03.2016 | 096.C-0248(B) | 30 | 70 | 48.6 | 1.05 | 2.7 ± 0.3 | 0.69 ± 0.07 | |
| HD135344 B | N_Ha | 31.03.2016 | 096.C-0248(B) | 50 | 107 | 71.7 | 1.04 | 4.4 ± 1.2 | 0.47 ± 0.17 |
| TW Hya | B_Ha | 23.03.2016 | 096.C-0267(B) | 80 | 131 | 134.1 | 1.16 | 1.4 ± 0.4 | 1.33 ± 0.53 |
| HD100546 | B_Ha | 23.04.2015 | 095.C-0273(A) | 10 | 1104e | 68.3e | 1.46 | 1.7 ± 0.2 | 0.98 ± 0.28 |
| HD169142 | B_Ha | 09.05.2015 | 095.C-0298(A) | 50 | 90 | 123.2 | 1.01 | 1.4 ± 0.1 | 1.24 ± 0.04 |
| MWC 758 | B_Ha | 30.12.2015 | 096.C-0267(A) | 60 | 194 | 54.8 | 1.63 | 3.2 ± 0.8 | 1.39 ± 0.24 |
Notes. (a) Each dataset consists of data obtained in one of the two Hα filters and simultaneous data taken with the continuum filter inserted in the other ZIMPOL camera. (b) DIT = Detector integration time, i.e., exposure time per image frame. (c)Coherence time. (d) Mean DIMM seeing measured during the observation. (e)As we explain in Sect. 4.4 and Appendix E, for this dataset a frame selection was applied, which reduced the number of frames to 366 and the field rotation to 20.7°.
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