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Table 3

Results from the LSD analysis of the HARPSpol data obtained using a line mask that includes (wHe) or excludes (woHe) helium lines.

Star & Date Mask ⟨ Bz ⟩ (V) FAP (V) Detection FAP (N) Detection S/N S/N # lines
month/year [G] V N I V LSD
β CMa 23 wHe − 8.4 ± 6.8 5.6 × 10-4 MD 1.0 × 10-1 ND 664 26 712 204
December 26 wHe − 3.3 ± 5.6 9.7 × 10-4 MD 2.7 × 10-1 ND 681 31 809
2013 27 wHe − 22.4 ± 6.1 1.7 × 10-8 DD 6.3 × 10-1 ND 628 29 191
28 wHe − 5.8 ± 5.9 2.3 × 10-9 DD 1.8 × 10-4 MD 710 30 536
23 woHe − 9.4 ± 8.4 1.1 × 10-4 MD 4.8 × 10-2 ND 664 21 436 161
26 woHe − 1.3 ± 6.9 8.0 × 10-8 DD 1.5 × 10-2 ND 681 25 355
27 woHe − 19.4 ± 7.5 5.1 × 10-9 DD 5.3 × 10-1 ND 628 23 319
28 woHe − 16.1 ± 7.2 2.1 × 10-11 DD 1.1 × 10-1 ND 710 24 270
β CMa 21 wHe − 29.0 ± 8.0 4.2 × 10-4 MD 2.0 × 10-1 ND 554 21 488 204
April 21 wHe − 27.8 ± 7.9 3.2 × 10-3 ND 4.9 × 10-1 ND 607 22 821
2014 21 wHe − 28.8 ± 7.7 9.2 × 10-4 MD 8.3 × 10-1 ND 589 23 610
21 wHe − 21.9 ± 7.5 1.3 × 10-5 MD 3.7 × 10-1 ND 611 23 930
21 wHe − 24.0 ± 7.9 1.1 × 10-2 ND 8.4 × 10-1 ND 596 22 413
21 wHe − 26.4 ± 7.9 3.6 × 10-1 ND 1.7 × 10-2 ND 572 22 674
Average 21 wHe − 26.0 ± 3.2 2.7 × 10-14 DD 9.6 × 10-1 ND – 55 602
21 woHe − 40.4 ± 10.1 3.6 × 10-3 ND 1.3 × 10-1 ND 554 17 110 161
21 woHe − 15.6 ± 9.7 3.4 × 10-3 ND 2.6 × 10-2 ND 607 18 202
21 woHe − 27.3 ± 9.4 1.4 × 10-3 ND 3.4 × 10-1 ND 589 18 863
21 woHe − 18.8 ± 9.2 3.6 × 10-8 DD 6.9 × 10-1 ND 611 19 124
21 woHe − 22.9 ± 9.7 1.4 × 10-5 MD 7.0 × 10-1 ND 596 17 934
21 woHe − 15.8 ± 9.6 7.3 × 10-3 ND 5.0 × 10-2 ND 572 18 112
Average 21 woHe − 23.2 ± 3.9 3.3 × 10-16 DD 9.7 × 10-1 ND – 44 703
ϵ CMa 23 wHe − 18.4 ± 4.7 5.3 × 10-5 MD 4.4 × 10-1 ND 634 30 733 153
December 24 wHe − 1.5 ± 5.9 5.6 × 10-2 ND 6.3 × 10-2 ND 590 24 345
2013 27 wHe 0.0 ± 4.3 5.4 × 10-4 MD 5.7×10-1 ND 679 33 806
23 woHe − 11.0 ± 5.8 1.5 × 10-6 DD 4.1 × 10-1 ND 634 21268 119
24 woHe 9.3 ± 7.3 3.7 × 10-6 DD 2.9 × 10-1 ND 590 16 789
27 woHe 4.6 ± 5.3 3.1 × 10-11 DD 3.7 × 10-1 ND 679 23 398
ϵ CMa 21 wHe − 6.6 ± 4.6 2.4 × 10-2 ND 4.6 × 10-2 ND 648 31 485 153
April 21 wHe − 8.8 ± 4.6 2.8 × 10-2 ND 3.7 × 10-1 ND 631 31 261
2014 21 wHe − 1.4 ± 4.6 1.3 × 10-1 ND 6.2 × 10-3 ND 646 31 766
21 wHe − 8.6 ± 4.6 1.6 × 10-1 ND 7.9 × 10-1 ND 645 31 630
21 wHe 3.0 ± 4.6 4.7 × 10-4 MD 2.8 × 10-2 ND 606 31 571
Average 21 wHe − 4.5 ± 2.1 9.4 × 10-6 DD 1.5 × 10-1 ND – 69 580
21 woHe − 9.3 ± 5.6 7.8 × 10-5 MD 1.4 × 10-1 ND 648 21 705 119
21 woHe 3.7 ± 5.7 1.4 × 10-3 ND 5.5 × 10-1 ND 631 21 533
21 woHe 3.9 ± 5.6 4.7 × 10-6 DD 5.2 × 10-3 ND 646 21 831
21 woHe 15.2 ± 5.6 7.8 × 10-3 ND 6.3 × 10-2 ND 645 21 726
21 woHe 4.0 ± 5.6 2.8 × 10-2 ND 3.5 × 10-1 ND 606 21 756
Average 21 woHe − 4.1 ± 2.5 <10-16 DD 6.4 × 10-1 ND – 48 535

Notes. The first two columns indicate the star name and the date of observation. Column three indicate the adopted line mask. Column four lists the ⟨ Bz ⟩ values obtained from each Stokes V LSD profile, for which the FAP is given in column five. Column six shows the detection flag obtained for each Stokes V LSD profile, where marginal (MD) and definite (DD) detections are marked in bold face (ND stays for non-detection). Column seven and eight give the FAP obtained from each LSD profile of the null spectrum and the relative detection flag, respectively. Column nine gives the S/N (per-pixel) of Stokes I, calculated over an 8 Å region at ~4990 Å. Column ten lists the S/N of the LSD Stokes V profile. The last column lists the number of lines used in the line mask. For β CMa and ϵ CMa, respectively, we adopted a range of 140 km s-1 (i.e., ±70 km s-1 from the line center) and 120 km s-1 (i.e., ±60 km s-1 from the line center) for the calculation of the magnetic field.

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