Table 1
Linear polarisation observations of χ Cyg (Stokes U and/or Stokes Q) from September 2007 to December 2016.
| Stokes | Obs. date | Julian date (JD) | Phase | Exposure | N | S∕N |
|---|---|---|---|---|---|---|
| (dd/mm/yyyy) | (+2 450 000) | (ϕ) | (in s) | (Q and U) | (/2.6 km s−1) | |
| Q and U | 04/09/2007 | 4347.86 | 0.94 | 400 | 1 & 1 | 1527 |
| Q and U | 28/05/2015 | 7171.11 | 0.84 | 400 | 2 & 2 | 1464 |
| Q and U | 01/06/2015 | 7175.12 | 0.85 | 400 | 2 & 2 | 1488 |
| Q and U | 26/06/2015 (a) | 7200.05 | 0.91 | 400 | 1 & 1 | 1369 |
| Q and U | 28/06/2015 (a) | 7202.02 | 0.92 | 400 | 1 & 1 | 1479 |
| Q and U | 19/07/2015 | 7222.98 | 0.97 | 400 | 3 & 4 | 1391 |
| Q and U | 10/08/2015 | 7245.01 | 0.02 | 400 | 4 & 4 | 990 |
| Q and U | 20/08/2015 | 7254.91 | 0.05 | 400 | 4 & 4 | 1270 |
| Q and U | 10/09/2015 (a) | 7275.96 | 0.10 | 400 | 2 & 2 | 1470 |
| Q and U | 11/09/2015 (a) | 7276.82 | 0.10 | 400 | 2 & 2 | 1260 |
| Q and U | 09/10/2015 | 7304.93 | 0.17 | 400 | 2 & 2 | 1568 |
| Q and U | 16/10/2015 | 7311.80 | 0.19 | 400 | 2 & 2 | 904 |
| Q and U | 15/11/2015 (a) | 7341.86 | 0.26 | 400 | 2 & 2 | 882 |
| Q and U | 16/11/2015 (a) | 7342.74 | 0.26 | 400 | 2 & 2 | 1048 |
| Q and U | 07/08/2016 (a) | 7607.88 | 0.91 | 400 | 4 & 4 | 1349 |
| Q and U | 08/08/2016 (a) | 7608.89 | 0.92 | 400 | 4 & 4 | 1347 |
| Q and U | 24/08/2016 | 7625.00 | 0.95 | 400 | 4 & 4 | 1556 |
| Q and U | 24/09/2016 | 7655.90 | 0.03 | 400 | 3 & 3 | 1096 |
| Q and U | 21/10/2016 | 7682.83 | 0.09 | 400 | 3 & 3 | 1183 |
| Q | 26/10/2016 (b) | 7687.86 | 0.11 | 400 | 3 | 909 |
| U | 27/10/2016 (b) | 7687.86 | 0.11 | 400 | 3 | 682 |
| Q and U | 07/12/2016 | 7729.73 | 0.21 | 400 | 4 & 4 | 1548 |
| Q and U | 20/12/2016 | 7742.75 | 0.24 | 400 | 4 & 4 | 1224 |
Notes. For each observation, the first column gives the observed Stokes parameter(s). The second and third columns give the date of observation in the Gregorian and Julian calendars, respectively. The fourth column gives the phase of the star (ϕ), considering an ephemeris giving ϕ = 0 at maximum light for JD = 2 457 234.4 (30 July 2015) and a period of 408.7 days. All the observations have been replaced on a single pseudo-cycle (from ϕ = 0.00 to ϕ =1.00). The last columns give the exposure time (in seconds), number of spectra for each parameter and the maximum S/N in each spectrum, respectively. (a) Observations that have been pushed together. (b)One Stokes parameter is missing for this date, therefore this parameter has not been considered in our study.
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