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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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