2015A&A...582A..45F


Query : 2015A&A...582A..45F

2015A&A...582A..45F - Astronomy and Astrophysics, volume 582A, 45-45 (2015/10-1)

B fields in OB stars (BOB): Low-resolution FORS2 spectropolarimetry of the first sample of 50 massive stars.

FOSSATI L., CASTRO N., SCHOELLER M., HUBRIG S., LANGER N., MOREL T., BRIQUET M., HERRERO A., PRZYBILLA N., SANA H., SCHNEIDER F.R.N., DE KOTER A. (The BOB Collaboration)

Abstract (from CDS):

Within the context of the collaboration ``B fields in OB stars'' (BOB), we used the FORS2 low-resolution spectropolarimeter to search for a magnetic field in 50 massive stars, including two reference magnetic massive stars. Because of the many controversies of magnetic field detections obtained with the FORS instruments, we derived the magnetic field values with two completely independent reduction and analysis pipelines. We compare and discuss the results obtained from the two pipelines. We obtained a general good agreement, indicating that most of the discrepancies on magnetic field detections reported in the literature are caused by the interpretation of the significance of the results (i.e., 3-4σ detections considered as genuine, or not), instead of by significant differences in the derived magnetic field values. By combining our results with past FORS1 measurements of HD46328, we improve the estimate of the stellar rotation period, obtaining P=2.17950±0.00009days. For HD125823, our FORS2 measurements do not fit the available magnetic field model, based on magnetic field values obtained 30 years ago. We repeatedly detect a magnetic field for the O9.7V star HD54879, the HD164492C massive binary, and the He-rich star CPD-573509. We obtain a magnetic field detection rate of 6±4%, while by considering only the apparently slow rotators we derive a detection rate of 8±5%, both comparable with what was previously reported by other similar surveys. We are left with the intriguing result that, although the large majority of magnetic massive stars is rotating slowly, our detection rate is not a strong function of the stellar rotational velocity.

Abstract Copyright:

Journal keyword(s): stars: magnetic field - stars: early-type - stars: massive

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 476 1
2 HD 42088 * 06 09 39.5728368936 +20 29 15.450599580 6.73 7.58 7.57 8.45   O6V((f))z 241 0
3 HD 44597 * 06 23 28.5386913264 +20 23 31.655646420 8.59 9.23 9.05     O9V 39 0
4 HD 44811 * 06 24 38.3546476632 +19 42 15.806335392 7.72 8.54 8.48 8.91   O7V(n)z 62 0
5 HD 46056 Em* 06 31 20.8608343776 +04 50 03.842554740 7.60 8.36 8.16 8.16 8.09 O8Vn 218 0
6 HD 259012 ** 06 31 33.4677 +04 50 39.699 8.94 9.59 9.38     B1Vn+B4/A1Ve 48 0
7 HD 46106 Y*O 06 31 38.3968383096 +05 01 36.396422796 7.33 8.08 7.93 7.76 7.66 O9.7III(n) 148 0
8 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 313 0
9 HD 259105 * 06 31 52.0018444848 +04 55 57.252934128 8.88 9.57 9.38     B1V 61 0
10 HD 46149 SB* 06 31 52.5319291296 +05 01 59.178678024 7.03 7.80 7.61 7.54 7.36 O8.5V 268 0
11 HD 46150 Em* 06 31 55.5205071744 +04 56 34.296516096 6.03 6.86 6.73 6.50 6.41 O5V((f))z 386 0
12 HD 46223 Y*O 06 32 09.3068103600 +04 49 24.705695568 6.73 7.50 7.28 6.95 6.79 O4V((f)) 370 0
13 HD 46202 bC* 06 32 10.4706981304 +04 57 59.764912343 7.60 8.332 8.269 7.98 7.86 O9.2V 275 0
14 HD 46966 ** 06 36 25.8880460976 +06 04 59.474397540 5.91 6.83 6.87     O8.5IV 199 0
15 HD 48279A * 06 42 40.548 +01 42 58.23   8.02 7.96 8.72   O8.5VzNstrvar? 10 0
16 HD 289002 * 06 45 13.3725491952 +02 08 14.685250596 10.06 10.62 10.44     B1 249 0
17 NAME CMa OB1 As* 07 07.0 -10 28           ~ 140 0
18 HD 54879 SB* 07 10 08.1487629504 -11 48 09.838940004 6.8 7.60 7.65     O9.7V 79 0
19 HD 60848 Be* 07 37 05.7325392528 +16 54 15.300327852 5.55 6.67 6.87     O8:V:pe 136 0
20 V* QU Pup bC* 07 51 40.3580164320 -42 53 17.533822092 4.98 5.847 6.032     B2III 55 0
21 HD 72648 * 08 32 18.9890145000 -43 55 53.360572260 7.15 7.75 7.62     B3III(II) 55 1
22 HD 72754 Be* 08 32 23.3805568848 -49 36 04.770238860 6.38 9.09 8.88 7.77   B2(Ia)pe(_sh) 106 0
23 CPD-57 3509 * 10 35 48.9972741480 -58 14 54.297364704 10.16 10.82 10.70 10.59 10.49 B2III 37 0
24 NGC 3293 OpC 10 35 53 -58 13.9           ~ 304 0
25 NGC 3324 19 * 10 37 21.8824094304 -58 37 10.026510672   11.92 11.72 11.89   ~ 8 0
26 HD 92207 sg* 10 37 27.0681291600 -58 44 00.016141092 5.71 5.95 5.45     A0Ia 152 0
27 HD 93027 Y*O 10 43 17.9451218184 -60 08 03.279537240 7.86 8.72 8.72 9.48   O9.5IV 75 0
28 CPD-59 2624 SB* 10 45 05.8358470968 -59 43 07.684616964 9.324 10.018 9.740   9.221 O9.7IV 56 0
29 HD 93521 * 10 48 23.5113981120 +37 34 13.083332412 5.67 6.79 7.03     O9.5IIInn 418 1
30 HD 95568 bC* 11 00 39.5891327592 -62 36 50.236157268   9.65 9.57 9.94   O9/B0V 23 0
31 HD 97991 * 11 16 11.7119307144 -03 28 19.095029580 6.28 7.19 7.41     B2/B3V 135 0
32 HD 101008 * 11 36 56.1752293128 -63 23 52.509820560 8.32 9.14 9.16 9.70   O9V 72 0
33 HD 102475 * 11 47 18.1823749752 -62 26 10.246842456 7.66 9.06 9.09 9.36   B1II 63 0
34 HD 112784 * 13 00 05.6358335496 -60 35 37.219832124 7.50 8.31 8.26 9.11   O9.5III 78 0
35 HD 116852 * 13 30 23.5185791544 -78 51 20.547734652 8.29 8.38 8.47     O8.5II-III((f)) 143 1
36 HD 117357 bC* 13 31 15.4959291912 -61 43 57.436151880 8.51 9.84 9.58 9.61   O9.5/B0V 47 0
37 HD 118198 * 13 36 59.4939290040 -63 38 45.714273036 7.92 9.19 9.32 9.29   O9.7III 41 0
38 * a Cen Ro* 14 23 02.2390294 -39 30 42.549250 3.50 4.24 4.42 4.53 4.70 B2V 268 0
39 * ome Sco bC* 16 06 48.4269211 -20 40 09.090235 3.10 3.92 3.97 3.91 3.99 B1V 461 0
40 HD 152218 EB* 16 53 59.9905195488 -41 42 52.817214240 7.02 7.78 7.570   7.243 O9IV+B0:V: 146 0
41 HD 152246 SB* 16 54 05.2976157264 -41 04 46.117795944 6.69 7.45 7.29 8.19   O9IV 120 1
42 V* V1297 Sco SB* 16 56 05.2157203176 -40 20 57.576260184 7.87 9.11 9.29 9.29   O7.5Vz 129 0
43 * gam Ara Be* 17 25 23.6593111 -56 22 39.814775 2.25 3.21 3.34     B1Ib 266 0
44 HD 157857 Em* 17 26 17.3317676808 -10 59 34.785507480 7.16 7.95 7.78     O6.5II(f) 163 0
45 HD 163800 * 17 58 57.2584170624 -22 31 03.165347496 6.61 7.27 7.00 6.68 6.49 O7.5III((f)) 141 0
46 EM* LkHA 123 Em* 18 02 23.13015 -23 01 59.9462   8.72 6.80 9.37   B1V 42 0
47 HD 164492 Y*O 18 02 23.5527520992 -23 01 50.999556180 6.49 7.49 6.80 7.52   O7.5Vz 222 0
48 M 20 OpC 18 02 42 -22 58.3           ~ 422 1
49 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Iaep 183 1
50 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 270 2
51 ** H 40C * 18 49 49.7 +32 48 14     10.3     ~ 4 0

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2023.02.01-19:26:51

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