Table A.1
Observing log.
| TCB mid (+245…) | ϕ (Eqs. 1) | texp (min) | ∆λ (blue; red) (Å) | S/NV | S/NI | ||
|---|---|---|---|---|---|---|---|
| blue | red | blue | red | ||||
| ξ Boo A: | |||||||
| 8609.7427427 | 0.829 | 5 | 4800-5441; 6278-7419 | 1405 | 1749 | 2145 | 2982 |
| 8610.8282148 | 0.998 | 5 | 4800-5441; 6278-7419 | 1368 | 1741 | 2016 | 2910 |
| 8611.7681903 | 0.144 | 5 | 4800-5441; 6278-7419 | 1191 | 1594 | 1591 | 2392 |
| 8616.8333173 | 0.931 | 5 | 4800-5441; 6278-7419 | 567 | 820 | 1173 | 1773 |
| 8617.6923984 | 0.065 | 5 | 4800-5441; 6278-7419 | 1390 | 1739 | 2118 | 2848 |
| 8617.8769492 | 0.094 | 5 | 4800-5441; 6278-7419 | 1699 | 2128 | 2448 | 3383 |
| 8619.7004465 | 0.377 | 5 | 4800-5441; 6278-7419 | 1284 | 1685 | 1969 | 2804 |
| 8619.8758547 | 0.405 | 5 | 4800-5441; 6278-7419 | 1539 | 1976 | 2369 | 3363 |
| ξ Boo B: | |||||||
| 8609.7860453 | 0.123 | 10 | 4800-5441; 6278-7419 | 956 | 1351 | 994 | 1848 |
| 8610.8816143a | 0.216 | 10 | 4800-5441; 6278-7419 | 789 | 85 | 297 | 236 |
| 8611.8163769 | 0.293 | 10 | 4800-5441; 6278-7419 | 787 | 1171 | 893 | 1718 |
| 8616.8730350 | 0.717 | 10 | 4800-5441; 6278-7419 | 818 | 1187 | 867 | 1713 |
| 8617.8435912b | 0.798 | 5 | 4800-5441; 6278-7419 | 605 | 954 | 705 | 1472 |
| 8619.7390032 | 0.957 | 10 | 4800-5441; 6278-7419 | 510 | 796 | 556 | 1084 |
Notes. The first column gives the Barycentric coordinate time (TCB) for the time of mid exposure for Stokes I. The second column is the rotational phase based on the respective ephemeris in Eq. (1) for Stokes I. S/N is per pixel and is the 95% quantile within the respective wavelength region ∆λ. a. Bad weather. b. Exposure time was accidentally set to 4 min in the blue, and to 5 min in the red.
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