Table 1.
Observing log of bright non-polarised standard stars and the highly polarised MWD WD 1900+705.
| Star | G | Date | UT | JD – | Exp. | V/I (%) | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| yyyy-mm-dd | hh:mm | 2400000 | (s) | B′ | V′ | R′ | |||||
| HD 107146 | 6.9 | 2022-06-27 | 21:23 | 59758.391 | 1680 | 0.0005 | 0.0007 | −0.0006 | 0.0007 | −0.0001 | 0.0006 |
| HD 115043 | 6.7 | 2022-06-28 | 21:21 | 59759.390 | 1520 | 0.0005 | 0.0008 | −0.0001 | 0.0012 | −0.0004 | 0.0004 |
| HD 122652 | 7.0 | 2022-06-29 | 21:18 | 59760.387 | 1520 | −0.0012 | 0.0009 | −0.0015 | 0.0015 | −0.0019 | 0.0014 |
| HD 122676 | 7.1 | 2022-06-30 | 21:17 | 59761.387 | 1520 | 0.0000 | 0.0011 | 0.0003 | 0.0010 | 0.0018 | 0.0008 |
| HD 124694 | 7.0 | 2022-07-01 | 21:16 | 59762.386 | 1520 | −0.0012 | 0.0008 | 0.0014 | 0.0011 | 0.0002 | 0.0007 |
| HD 135891 | 6.9 | 2022-07-02 | 21:18 | 59763.387 | 1520 | 0.0014 | 0.0008 | 0.0006 | 0.0010 | −0.0004 | 0.0007 |
| HD 117860 | 7.2 | 2022-07-03 | 21:16 | 59764.386 | 1520 | −0.0004 | 0.0010 | −0.0002 | 0.0012 | 0.0005 | 0.0006 |
| WD 1900+705 | 13.2 | 2021-07-02 | 22:22 | 59398.432 | 640 | 3.756 | 0.016 | 3.604 | 0.016 | 3.827 | 0.019 |
| 2022-07-02 | 00:25 | 59762.518 | 3.789 | 0.016 | 3.602 | 0.019 | 3.838 | 0.018 | |||
Notes. Polarisation values are given assuming as instrumental polarisation the values of 0.0121 ± 0.0004%, 0.0109 ± 0.0005%, and 0.0084 ± 0.0004% in the B′, V′, and R′ filters, respectively. For comparison, we report the polarisation values of WD 1900+705 measured in our 2021 and 2022 runs.
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