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Table 2

Journal of spectropolarimetric observations of HD 24712.

UT Date Stokes HJD (2 455 000+) S/N Median S/N
parameters Q U V δϕ range Q U V

4 Jan. 2010 Q U V 200.7184 200.6962 200.7421 0.772 0.002 121–384 309 343 224
5 Jan. 2010 Q U V 201.7130 201.7364 201.7561 0.853 0.002 95–342 287 300 181
6 Jan. 2010 Q U V 202.6599 202.6240 202.6981 0.928 0.004 191–458 405 326 387
7 Jan. 2010 Q U V 203.6702 203.7121 203.6274 0.009 0.004 235–567 504 408 484
8 Jan. 2010 Q U V 204.6082 204.6546 204.7039 0.088 0.005 303–586 528 529 497
9 Jan. 2010 Q U V 205.6338 205.6802 205.7272 0.170 0.005 170–483 429 379 307
10 Jan. 2010 Q U V 206.6092 206.6560 206.7032 0.248 0.005 267–565 498 506 457
11 Jan. 2010 Q U 207.6547 207.7014 0.330 0.003 261–510 440 451
13 Jan. 2010 Q U V 209.6057 209.6518 209.6990 0.489 0.005 181–571 512 480 382
14 Jan. 2010 Q U V 210.6245 210.6697 210.7157 0.570 0.005 200–573 510 461 360
15 Jan. 2010 Q U V 211.6183 211.6683 211.7185 0.651 0.005 201–528 454 469 365
16 Jan. 2010 Q U V 212.6248 212.6704 212.7052 0.731 0.004 189–580 512 517 330
17 Jan. 2010 Q U V 213.6272 213.6723 213.7132 0.811 0.004 162–607 545 458 297
13 Aug. 2010 V 421.8958 0.525 0.001 168–336 302
14 Feb. 2011 V 606.5350 0.346 0.001 278–497 446
15 Feb. 2011 Q U V 607.5200 607.5541 607.5882 0.428 0.003 223–508 451 417 394

Notes. First column gives the UT date at the beginning of each observing night. Column 2 indicates the Stokes parameters observed (in addition to Stokes I). Heliocentric Julian Dates (HJD) at mid-exposure for each observed Stokes parameter are given in Cols. 3–5. Mean phase, , and the maximum difference, δϕ, between and phases of individual Stokes parameter observations are presented in Cols. 6–7. Rotational phases were calculated according to our improved ephemeris (Sect. 7). The range of the S/N for two or three Stokes parameter observations and the median S/N for each individual Stokes parameter observation are presented in Cols. 8–11. The median S/N was calculated using several orders around λ = 5500 Å, where maximum counts were reached.

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