Table 1
Observation log.
| Filter | Average JD | Exp time | DIT[s] | λ° | Δλ | AM | θ | FWH M ⋆ | Peak PD | MPF | IPF | Rem. |
| [2 457 000+] | [min] | x NDIT | [nm] | [nm] | [′′] | [mas] | [%] | [%] | [%] | |||
|
|
||||||||||||
| V – 11 Dec. 14 | 2.563 | 42.7 | 4 × 10 | 554.0 | 80.6 | 1.40 | 1.0 | 70.6 | 4.8 | 1.85 ± 0.15 | 1.25 ± 0.1 | – |
| cntHα – 10 Dec. 14 | 1.767 | 48.0 | 10 × 4 | 644.9 | 4.1 | 1.40 | 1.35 | 72.1 | 3.0 | 3.15 ± 0.2 | 2.3 ± 0.1 | – |
| cntHα – 28 Jan. 15 | 50.534 | 11.5 | 1.2 × 36 | 644.9 | 4.1 | 1.25 | 0.93 | 59.4 | 9.0 | 5.45 ± 0.9 | 3.6 ± 0.5 | – |
| cnt820 – 10 Dec. 14 | 2.589 | 4.8 | 1.2 × 30 | 817.3 | 19.8 | 1.35 | 1.1 | 58.3 | – | – | – | ND1 |
| cnt820 – 10 Dec. 14 | 2.584 | 14.4 | 1.2 × 30 | 817.3 | 19.8 | 1.35 | 1.2 | – | – | – | sat. | |
Notes. The average Julian date and the total integration time of the observations are given in Cols. 2 and 3. DIT is the exposure time of the individual frames and NDIT is the number of frames per exposure. Each cycle (DIT × NDIT) was repeated four times to obtain + Q, − Q, + U, and − U frames and the whole cycle was repeated several times for each filter and epoch until the total exposure time was reached. AM and θ are the airmass and the visible seeing respectively. λ° and Δλ are the central wavelength and the FWHM of the filters used. FWHM⋆ is the azimuthally-averaged FWHM observed for R Dor. Peak PD, IPF, and MPF (defined in Sect. 3.2) stand, respectively, for the peak value of the polarisation degree, the integrated polarised fraction, and the maximum polarised fraction (not given for cnt820, see Sect. 2.2.2). In the last column, ND1 is the neutral density filter used and sat. indicates that the CCD is saturated.
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