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Table 1

Summary of observations and measured visibilities.

Date JDca AH λ Δλ Bp Arg. S / N CALb φrotc erd
dd/mm/yy [days] [h] [nm] [nm] [m] [deg]
31/07/08 4677.5 3.17 635.00 20.00 104 55 15  ± 6 0.684  ± 0.061  ± 0.020 C1-S 0.62 1.37
31/07/08 4677.5 3.18 655.00 20.00 104 55 35  ± 8 0.611  ± 0.083  ± 0.016 C1-S 0.62 1.37
08/10/08 4746.5 –0.03 528.75 12.50 108 101 47  ± 10 0.671  ± 0.064  ± 0.030 C1-S-C1 0.37 1.46
08/10/08 4746.5 1.40 528.75 12.50 26 –27 93  ± 33 0.563  ± 0.048  ± 0.001 C1-S 0.37 1.46
08/10/08 4746.5 –0.03 541.50 13.00 108 101 41  ± 14 0.578  ± 0.049  ± 0.025 C1-S-C1 0.37 1.46
08/10/08 4746.5 1.40 541.50 13.00 26 –27 86  ± 28 0.658  ± 0.050  ± 0.001 C1-S 0.37 1.46
08/10/08 4746.5 -0.03 680.00 20.00 108 101 57  ± 10 0.738  ± 0.065  ± 0.020 C1-S-C1 0.37 1.46
08/10/08 4746.5 1.40 680.00 20.00 26 –27 72  ± 26 0.586  ± 0.028  ± 0.001 C1-S-C1 0.37 1.46
08/10/08 4746.5 –0.03 700.00 20.00 108 101 79  ± 29 0.674  ± 0.051  ± 0.017 C1-S-C1 0.37 1.46
08/10/08 4746.5 1.40 700.00 20.00 26 –27 101  ± 19 0.597  ± 0.029  ± 0.001 C1-S-C1 0.37 1.46
23/11/08 4792.5 3.06 507.50 15.00 25 –44 51  ± 9 0.545  ± 0.049  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 3.52 507.50 15.00 24 –49 15  ± 5 0.604  ± 0.107  ± 0.002 C2-S 0.21 4.02
23/11/08 4792.5 4.04 507.50 15.00 23 –55 28  ± 6 0.563  ± 0.050  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 1.28 660.00 20.00 107 83 41  ± 10 0.627  ± 0.152  ± 0.017 C1-S 0.21 4.02
23/11/08 4792.5 1.77 660.00 20.00 107 76 58  ± 6 0.489  ± 0.053  ± 0.012 C2-S 0.21 4.02
23/11/08 4792.5 3.06 660.00 20.00 25 –44 108  ± 35 0.590  ± 0.062  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 3.52 660.00 20.00 24 –49 34  ± 11 0.639  ± 0.088  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 4.04 660.00 20.00 23 –55 47  ± 14 0.585  ± 0.064  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 1.28 680.00 20.00 107 83 66  ± 17 0.583  ± 0.055  ± 0.015 C1-S 0.21 4.02
23/11/08 4792.5 1.77 680.00 20.00 107 76 66  ± 18 0.614  ± 0.075  ± 0.014 C2-S 0.21 4.02
23/11/08 4792.5 3.06 680.00 20.00 25 –44 134  ± 31 0.686  ± 0.081  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 3.52 680.00 20.00 24 –49 38  ± 15 0.702  ± 0.057  ± 0.001 C2-S 0.21 4.02
23/11/08 4792.5 4.04 680.00 20.00 23 –55 72  ± 9 0.600  ± 0.066  ± 0.001 C2-S 0.21 4.02
26/08/09 5068.5 –0.63 491.25 12.50 27 –6 47  ± 15 0.435  ± 0.033  ± 0.001 C2-S-C2 0.20 3.24
26/08/09 5068.5 –0.63 503.75 12.50 27 –6 51  ± 9 0.468  ± 0.023  ± 0.001 C2-S-C2 0.20 3.24
26/08/09 5068.5 –0.63 660.00 20.00 27 –6 39  ± 10 0.556  ± 0.040  ± 0.001 C2-S-C2 0.20 3.24
26/08/09 5068.5 4.11 660.00 20.00 23 –56 46  ± 8 0.655  ± 0.036  ± 0.001 C2-S-C2 0.20 3.24
26/08/09 5068.5 –0.64 680.00 20.00 27 –5 59  ± 15 0.574  ± 0.019  ± 0.001 C2-S-C2 0.20 3.24
26/08/09 5068.5 4.12 680.00 20.00 23 –56 70  ± 18 0.679  ± 0.034  ± 0.001 C2-S-C2 0.20 3.24

Notes. 

(a)

Julian date of observation defined by JDc = JD − 2   450   000.

(b)

Observation sequence. C1, C2 and S are for calibrator 1 (HD 192907), calibrator 2 (HD 214734) and science star respectively.

(c)

The reference Julian date (T0 = 2451238.15 days) and the rotation period (P = 12.00092 days) used to compute the phase are from Donati et al. (2001). The phase 0 is the phase at which the longitudinal magnetic field is at a maximum.

(d)

The elongation of the ring derived from Fig. 2 of Favata et al. (2009). See also Fig. 3.

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