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Table 2

Observations and results of magnetic measurements from MuSiCoS spectropolarimetry of β Cep at TBL at the Pic du Midi, 1998–2005.

Nr. Date HJD t exp S/N N LSD Puls. UV v rad v min B l σ(Bl) N l σ(Nl)
−2 451 100 min pxl-1 % Phase Phase km s-1 km s-1 G G G G
1 1998 Dec. 13 61.340 20 290 0.057 0.092 0.600 −23.8 −24.2 −98 55 37 55
2 1998 Dec. 14 62.337 40 310 0.052 0.331 0.683 −4.9 −0.6 −56 51 22 51
3 1998 Dec. 15 63.335 40 1160 0.013 0.567 0.766 −14.1 −13.2 33 13 11 13
4 1998 Dec. 16 64.345 40 450 0.034 0.870 0.851 −34.5 −38.9 71 33 3 33
5 1998 Dec. 17 65.246 20 920 0.015 0.601 0.926 −16.3 −16.3 81 15 2 15
6 1998 Dec. 17 65.342 30 1050 0.013 0.103 0.934 −23.0 −24.4 85 12 −16 12
7 1998 Dec. 18 66.256 40 740 0.021 0.904 0.010 −35.0 −39.7 66 20 −29 20
8 1998 Dec. 18 66.290 30 770 0.020 0.080 0.013 −23.4 −25.0 64 19 −14 19
9 1998 Dec. 18 66.314 30 950 0.015 0.207 0.015 −12.3 −9.8 91 14 0 13
10 1998 Dec. 18 66.338 30 940 0.013 0.334 0.017 −3.4 1.1 117 13 −9 13
11 1998 Dec. 18 66.368 27 910 0.015 0.489 0.019 −7.1 −3.3 114 14 6 14
12 1999 Jan. 13 92.256 40 760 0.020 0.397 0.176 −4.7 0.2 61 20 6 19
13 1999 Jan. 15 94.256 20 500 0.030 0.893 0.343 −34.9 −40.5 −50 29 9 29
14 1999 Jan. 24 103.263 20 660 0.023 0.180 0.094 −13.8 −12.2 116 22 −46 22
15 1999 Jan. 25 104.271 24 530 0.027 0.474 0.178 −5.5 −0.9 81 26 0 27
16 1999 June 30 259.504 40 690 0.022 0.406 0.113 −2.6 1.8 63 22 −5 22
17 1999 June 30 259.545 60 640 0.022 0.622 0.116 −21.5 −21.8 55 21 22 21
18 1999 June 30 260.492 40 670 0.021 0.590 0.195 −17.6 −16.2 73 21 6 21
19 1999 July 1 260.527 50 770 0.019 0.774 0.198 −31.3 −33.6 21 18 −23 18
20 1999 July 3 262.512 60 830 0.018 0.197 0.363 −8.4 −8.6 −47 17 11 17
21 1999 July 3 263.486 60 680 0.019 0.312 0.445 −1.4 2.0 −31 18 −27 17
22 1999 July 6 266.467 40 760 0.014 0.960 0.693 −28.1 −29.7 −22 14 −30 13
23 1999 July 7 267.417 60 790 0.012 0.950 0.772 −27.7 −30.7 −2 11 −26 11
1 2000 June 17 612.632 40 890 0.014 0.241 0.538 7.9 3.2 −69 20 −2 17
2 2000 June 21 616.592 48 930 0.014 0.030 0.868 −20.7 −16.7 94 21 27 19
3 2000 June 26 621.569 40 980 0.013 0.158 0.283 −0.7 −3.4 31 18 −18 16
4 2000 June 26 621.600 40 980 0.013 0.320 0.286 7.0 3.6 19 19 8 15
5 2000 June 28 623.641 28 640 0.021 0.035 0.456 −18.0 −15.5 −4 31 −7 29
6 2000 June 29 624.635 40 910 0.014 0.253 0.539 4.4 0.3 −35 21 15 18
7 2000 June 30 625.643 40 800 0.017 0.545 0.623 −8.6 −10.2 −59 26 −23 21
8 2000 July 5 630.614 20 530 0.025 0.642 0.037 −21.9 −19.8 137 37 −10 34
9 2000 July 5 630.631 20 540 0.025 0.731 0.038 −30.0 −26.0 84 38 54 36
10 2000 July 5 630.648 20 500 0.028 0.820 0.040 −33.1 −28.3 16 40 −16 38
11 2000 July 6 631.615 20 490 0.028 0.897 0.120 −29.7 −26.7 70 40 1 38
12 2000 July 6 631.651 20 380 0.035 0.086 0.123 −9.9 −10.6 107 50 −60 49
13 2000 July 7 632.667 20 500 0.026 0.419 0.208 6.6 1.7 100 38 6 37
14 2000 July 8 634.464 28 680 0.018 0.853 0.358 −34.2 −28.2 −41 26 11 24
15 2000 July 13 638.621 20 450 0.029 0.677 0.704 −23.5 −22.4 −130 46 11 43
16 2000 July 13 638.638 20 460 0.028 0.766 0.705 −30.1 −27.9 −20 43 −11 39
17 2000 July 17 642.581 20 600 0.021 0.465 0.034 −2.7 −5.1 93 31 −35 30
18 2000 July 17 642.598 20 670 0.020 0.555 0.035 −13.3 −13.4 66 30 8 28
19 2000 July 17 642.615 20 630 0.021 0.644 0.037 −23.6 −21.3 136 31 9 30
20 2000 July 17 642.631 20 580 0.023 0.728 0.038 −31.3 −27.3 164 34 8 33
21 2000 July 17 642.648 20 630 0.020 0.817 0.040 −32.2 −27.9 94 30 −26 29
1 2001 June 19 979.628 20 560 0.028 0.878 0.119 −25.5 −29.8 −62 28 12 26
2 2001 June 19 979.644 20 630 0.025 0.963 0.121 −20.5 −21.9 −35 24 −33 22
3 2001 June 20 980.602 20 580 0.027 0.991 0.201 −14.1 −12.9 27 26 −15 25
4 2001 June 20 980.619 20 590 0.026 0.080 0.202 −5.2 −1.8 8 26 4 25
5 2001 June 20 980.637 20 590 0.026 0.175 0.203 2.8 7.7 −15 25 38 25
6 2001 June 21 981.612 20 730 0.020 0.293 0.285 7.1 10.9 −57 19 4 18
7 2001 June 21 981.630 20 600 0.024 0.388 0.286 3.6 6.5 −16 23 −2 23
8 2001 June 21 981.656 16 480 0.034 0.524 0.288 −2.2 −0.3 0 34 10 34
9 2001 June 22 982.626 20 740 0.021 0.617 0.369 −15.9 −20.1 −96 21 13 20
10 2001 June 22 982.643 20 660 0.023 0.706 0.371 −22.2 −27.8 −156 23 36 22
11 2001 June 23 983.628 20 240 0.073 0.877 0.453 −24.6 −30.3 −196 73 102 72
13 2001 June 24 984.554 20 650 0.024 0.739 0.530 −25.7 −29.6 −186 24 −25 23
14 2001 June 24 984.571 20 710 0.022 0.828 0.531 −25.9 −30.2 −166 22 11 21
15 2001 June 25 985.523 20 610 0.027 0.826 0.611 −26.1 −29.9 −140 27 14 25
16 2001 June 25 985.540 20 630 0.026 0.915 0.612 −21.3 −23.4 −138 25 −24 23
17 2001 June 26 986.541 20 600 0.027 0.170 0.695 3.2 8.5 −60 27 51 25
19 2001 June 26 986.562 20 300 0.055 0.280 0.697 9.2 15.1 −104 55 88 54
20 2001 June 27 987.485 20 270 0.062 0.126 0.774 0.5 2.8 3 61 15 61
21 2001 June 27 987.502 20 410 0.040 0.215 0.776 5.8 9.1 35 39 −39 38
22 2001 June 27 987.520 20 400 0.040 0.310 0.777 7.7 11.5 −15 40 −1 41
23 2001 June 29 989.531 20 570 0.027 0.867 0.945 −23.7 −28.4 91 27 −21 26
24 2001 June 29 989.548 20 540 0.030 0.956 0.946 −17.4 −21.0 68 30 15 29
25 2001 June 30 990.533 20 690 0.023 0.128 0.028 −2.2 −0.8 57 23 −25 22
26 2001 June 30 990.553 20 670 0.022 0.233 0.030 5.5 9.4 67 22 −26 22
27 2001 July 1 991.573 20 560 0.027 0.588 0.115 −13.4 −13.7 51 26 −21 26
28 2001 July 1 991.591 20 640 0.024 0.682 0.116 −22.1 −24.3 100 24 34 24
29 2001 July 2 992.535 20 620 0.026 0.638 0.195 −20.0 −21.4 12 25 −31 25
30 2001 July 2 992.554 20 560 0.030 0.738 0.197 −25.9 −29.0 73 29 −44 28
31 2001 July 3 993.539 20 730 0.023 0.909 0.279 −21.1 −24.4 -36 22 −2 21
32 2001 July 3 993.557 20 750 0.022 0.003 0.280 −13.1 −14.2 -44 21 40 20
1 2002 June 11 1336.517 20 570 0.027 0.457 0.858 3.4 5.3 99 27 −34 27
2 2002 June 12 1337.521 20 520 0.032 0.728 0.942 −23.3 −28.4 46 33 56 32
3 2002 June 13 1338.537 28 450 0.035 0.062 0.027 −6.6 −7.3 88 34 −12 34
4 2002 June 14 1339.547 28 530 0.031 0.364 0.111 7.7 12.5 86 31 28 30
5 2002 June 15 1340.511 20 400 0.039 0.425 0.191 3.6 7.8 25 39 64 39
6 2002 June 16 1341.529 20 540 0.031 0.769 0.276 −24.8 −30.0 −36 30 −33 29
7 2002 June 17 1342.508 20 510 0.030 0.908 0.358 −21.9 −26.8 −61 29 −19 29
8 2002 June 17 1343.444 28 710 0.022 0.822 0.436 −24.8 −30.0 −67 22 −3 21
9 2002 June 17 1343.465 28 740 0.021 0.932 0.437 −19.8 −23.9 −106 21 −29 21
10 2002 June 18 1344.463 28 570 0.026 0.172 0.520 3.1 7.0 −70 26 24 25
11 2002 June 18 1344.484 28 700 0.023 0.282 0.522 9.9 15.9 −120 23 −8 23
12 2002 June 21 1346.524 20 490 0.033 0.991 0.692 −15.6 −15.1 −63 33 65 33
13 2002 June 21 1346.540 20 510 0.031 0.075 0.694 −7.4 −4.2 −62 31 34 31
14 2002 June 22 1348.497 20 690 0.023 0.349 0.857 6.2 9.5 80 23 −11 23
15 2002 June 24 1350.438 28 710 0.021 0.539 0.018 −8.9 −7.9 44 22 −30 21
16 2002 June 26 1351.531 28 710 0.022 0.277 0.109 7.2 13.0 30 23 0 22
17 2002 June 27 1352.556 28 300 0.054 0.658 0.195 −22.3 −24.1 9 53 15 52
18 2002 June 27 1352.578 28 540 0.031 0.773 0.197 −28.0 −30.0 52 30 18 30
1 2003 June 7 1697.613 27 580 0.028 0.119 0.948 −0.3 0.5 80 27 23 26
2 2003 June 9 1700.499 27 440 0.034 0.270 0.188 10.9 16.0 42 34 29 33
3 2003 June 12 1702.545 28 430 0.040 0.014 0.359 −12.6 −15.7 −73 39 29 37
4 2003 June 14 1704.575 20 550 0.028 0.671 0.528 −18.0 −20.3 −80 28 −37 28
5 2003 June 17 1707.647 20 590 0.026 0.798 0.784 −23.9 −29.3 29 26 12 26
6 2003 June 18 1709.449 24 640 0.023 0.258 0.934 8.5 12.7 100 23 −9 22
7 2003 June 18 1709.469 24 730 0.021 0.361 0.936 8.9 13.4 96 21 11 21
8 2003 June 20 1711.455 32 510 0.032 0.787 0.101 −26.1 −29.6 70 32 −29 31
9 2003 July 8 1728.553 28 550 0.029 0.550 0.526 −11.4 −11.4 −56 30 42 29
10 2003 July 26 1746.557 40 460 0.032 0.065 0.026 −15.6 −16.9 91 32 20 31
11 2003 July 30 1751.504 40 730 0.020 0.033 0.438 −17.6 −20.1 −148 20 −1 20
12 2003 Aug. 6 1757.536 40 830 0.017 0.700 0.941 −32.3 −36.4 71 17 −22 16
1 2004 June 2 2058.564 47 830 0.021 0.024 0.025 −19.6 −16.9 100 21 −8 19
2 2004 June 8 2064.510 47 910 0.023 0.238 0.521 7.5 2.1 −84 23 6 18
3 2004 June 26 2082.637 24 570 0.033 0.399 0.031 −33.9 −29.4 79 33 46 31
4 2004 July 1 2087.633 47 670 0.028 0.630 0.447 ... ... −94 29 −31 26
5 2004 July 2 2088.632 47 780 0.024 0.872 0.531 ... ... −153 24 19 21
6 2004 July 12 2098.508 35 600 0.031 0.721 0.354 −23.0 −18.2 −33 30 −6 29
7 2004 July 15 2101.505 35 910 0.021 0.455 0.603 11.9 7.2 −101 21 −15 19
8 2004 July 20 2106.571 35 570 0.034 0.050 0.025 −10.3 −8.5 69 34 19 32
9 2004 July 25 2111.532 35 700 0.026 0.095 0.439 −3.7 −3.3 −151 25 −19 23
10 2004 July 26 2112.575 35 730 0.024 0.571 0.526 −5.5 −5.7 −143 25 −25 23
11 2004 July 27 2114.500 35 870 0.021 0.673 0.686 −14.8 −13.6 −84 21 −25 19
12 2004 July 30 2116.502 35 750 0.028 0.183 0.853 7.9 5.1 41 27 2 25
13 2004 July 30 2117.446 35 790 0.023 0.138 0.932 3.7 2.0 110 22 12 21
14 2004 Aug. 7 2124.507 35 310 0.067 0.210 0.520 14.3 10.0 −43 67 45 64
15 2004 Aug. 10 2128.459 35 640 0.027 0.954 0.849 −21.6 −17.3 23 26 −4 24
16 2004 Aug. 12 2130.491 35 880 0.021 0.622 0.019 −12.4 −10.9 42 21 −9 19
17 2004 Aug. 14 2132.457 35 700 0.026 0.946 0.183 −17.9 −17.1 20 25 −19 24
18 2004 Aug. 24 2142.409 35 590 0.031 0.191 0.012 9.4 6.2 16 31 35 30
19 2004 Nov. 5 2215.277 47 750 0.025 0.730 0.084 −8.0 −5.0 108 24 11 24
20 2004 Nov. 17 2227.271 47 900 0.021 0.694 0.083 −16.2 −13.9 102 21 8 19
21 2004 Nov. 21 2231.258 47 920 0.021 0.627 0.415 −8.0 −5.0 −86 21 15 19
22 2004 Nov. 23 2233.272 47 970 0.020 0.198 0.583 14.1 10.8 −47 20 8 18
23 2004 Nov. 25 2235.302 47 980 0.021 0.854 0.752 −20.9 −17.3 −8 20 −17 17
24 2004 Nov. 27 2237.289 47 750 0.025 0.285 0.918 21.3 17.3 93 25 −24 23
1 2005 July 15 2466.629 20 710 0.020 0.262 0.028 12.0 8.7 86 26 −14 24
2 2005 July 15 2466.645 20 750 0.019 0.349 0.030 17.4 12.8 54 25 26 23

Notes.The first column identifies the sequence number of a full set of four subexposures in the given observing period. In case of missing numbers (in 2001), the obtained intermediate spectra (less than four) were used for the radial velocity study. The Barycentric Julian date is given at the centre of the total exposure time (texp). Column 5 lists the quality of the Stokes V spectra, which is expressed as the S/N per 4.5 km s-1 around 550 nm in the raw spectrum, and the relative rms noise level NLSD (per 4.5 km s-1 velocity bin) in the least-squares deconvolved Stokes V spectra. The phase in the radial velocity curve (with phase 0 defined at maximum) has been calculated with the ephemeris given by Pigulski & Boratyn (1992) in Col. 7. The UV (rotational) phase in Col. 8 has been derived from Eq. (3). The measured radial velocity (accuracy: 2.5 km s-1) is given in Col. 9, whereas the velocity shift, which is measured at minimum flux and used before calculating the magnetic field, is given in Col. 10. Columns 11 and 12 give the magnetic field values with their 1σ uncertainties. The last two columns give the computed magnetic values of the diagnostic null (or N) spectrum with their 1σ uncertainties.

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