Table 1
Average longitudinal magnetic field values obtained from the FORS 2 and HARPS observations.
| FORS 2 | |||||||||
|
|
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| Reduction | Date | HJD− | No. of | Exp. | S / N | ⟨ Bz ⟩V (G) | ⟨ Bz ⟩N (G) | ⟨ Bz ⟩V (G) | ⟨ Bz ⟩N (G) |
| 2 450 000 | frames | time (s) | Hydrogen | All | |||||
|
|
|||||||||
| Bonn | 07-Feb.-2014 | 6696.7341 | 10 | 35 | 2359 | −655 ± 109 | 22 ± 81 | −504 ± 54 | 69 ± 46 |
| Potsdam | −639 ± 121 | −16 ± 119 | −460 ± 65 | 76 ± 66 | |||||
|
|
|||||||||
| Bonn | 08-Feb.-2014 | 6697.7162 | 10 | 30 | 2398 | −978 ± 88 | −36 ± 76 | −653 ± 47 | 40 ± 43 |
| Potsdam | −877 ± 91 | −102 ± 105 | −521 ± 62 | 23 ± 63 | |||||
|
|
|||||||||
| HARPS | |||||||||
|
|
|||||||||
| Reduction | Date | HJD− | No. of | Exp. | S/N | ⟨ Bz ⟩V (G) | Detection | FAP | |
| 2 450 000 | frames | time (s) | |||||||
|
|
|||||||||
| Bonn (LSD) | −592 ± 7 | DD | < 10-15 | ||||||
| Potsdam (SVD) | 23-Apr.-2014 | 6770.4993 | 4 | 2700 | 347 | −583 ± 9 | DD | < 10-16 | |
| Potsdam (MT) | −584 ± 15 | – | – | ||||||
Notes. Column 1 indicates the group that performed the data reduction and analysis, which led to the results shown in the following columns. The heliocentric Julian date shown in Col. 3 indicates the beginning of the sequence of exposures. Column 4 gives the number of frames obtained during each night of observation and Col. 5 the exposure time of each frame. Column 6 gives the S/N per pixel of Stokes I calculated at about 4950 Å over a wavelength range of 100 Å. In the FORS 2 subtable, Cols. 7 and 8 give the ⟨ Bz ⟩ values obtained using the spectral regions covered by the hydrogen lines obtained from the Stokes V and N parameter spectrum, respectively. The same is given in Cols. 9 and 10, but using the full spectrum (see Sect. 3.1). In the HARPS subtable, Cols. 7 and 8 give the ⟨ Bz ⟩V values and the detection flag (DD, definite detection). Column 9 gives the false alarm probability (FAP) for those methods that provide it. The different detection techniques are listed in Col. 1 (see Sect. 3.2).
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