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Table 3

Journal of observations and results of magnetic measurements of σ Lup.

Nr. Obs.1 Date2 HJD3 t exp S/N4 Phase5 Bl   6 σ(Bl) Nl   7 σ(Nl)
−2 450 000 s pxl-1 G G G G

1 A 2007-12-28 4463.24031 4  ×  400 880 0.141 79 20 4 20
2 A 2008-01-01 4467.25522 4  ×  400 620 0.470 −69 27 −4 27
3 A 2008-12-15 4816.25084 4  ×  400 720 0.043 75 25 8 25
4 A 2008-12-16 4817.24836 4  ×  400 720 0.373 −39 24 −7 24
5 A 2008-12-17 4818.24066 4  ×  400 360 0.702 95 49 0 49
6 C 2009-02-17 4880.12491 4  ×  130 1015 0.195 69 24 22 24
7 C 2009-02-17 4880.13320 4  ×  130 1188 0.198 96 21 −4 21
8 C 2009-02-17 4880.14136 4  ×  130 1140 0.201 52 22 9 22
9 A 2009-04-08 4930.25755 4  ×  400 750 0.797 57 24 −23 24
10 C 2010-02-27 5255.10549 4  ×  200 1114 0.373 −70 22 1 22
11 C 2010-03-02 5258.09114 4  ×  200 1021 0.361 −15 24 −37 24
12 C 2010-03-03 5259.08881 4  ×  200 779 0.692 −15 31 −15 31
13 C 2010-03-04 5260.08395 4  ×  200 1099 0.021 117 22 −20 22
14 C 2010-03-05 5261.10469 4  ×  200 959 0.359 −43 25 −6 25
15 C 2010-03-07 5263.05040 4  ×  200 1303 0.004 114 19 −13 19
16 C 2010-03-07 5263.08299 4  ×  200 1326 0.014 103 19 −3 19
17 C 2010-03-08 5264.02698 4  ×  200 490 0.327 −28 50 26 50
18 C 2010-03-08 5264.03882 4  ×  200 624 0.331 −30 39 27 39
19 C 2010-03-08 5264.12734 4  ×  200 744 0.360 −31 33 −40 33
20 C 2010-05-28 5344.86081 4  ×  200 908 0.096 73 40 3 40
21 C 2010-05-28 5344.87315 4  ×  200 579 0.100 14 186 28 186
22 C 2010-05-28 5344.88541 4  ×  200 664 0.104 173 62 75 62
23 C 2010-05-30 5346.84258 4  ×  200 980 0.752 27 28 23 28
24 C 2010-05-31 5347.83115 4  ×  200 1291 0.079 117 22 15 22
25 C 2010-06-01 5348.88552 4  ×  200 870 0.428 −123 29 52 29
26 C 2010-06-02 5349.82460 4  ×  200 963 0.739 1 26 11 26

Notes. 1. A = obtained with the SEMPOL spectropolarimeter attached to the UCLES at the AAT; C = with ESPaDOnS attached to the CFHT. – 2. Date when the first observation started. – 3. Calculated at the center of the total exposure time (texp) of Col. 5. – 4. Quality of the Stokes V spectra, expressed as the signal to noise ratio per pixel around 550 nm in the reduced spectrum. – 5. Rotational phase, calculated with Eq. (5). – 6. Longitudinal magnetic field values with their 1-σ uncertainties. – 7. Computed magnetic values of the diagnostic null (or N) spectrum with their 1-σ uncertainties.

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