2011A&A...528A.151H


Query : 2011A&A...528A.151H

2011A&A...528A.151H - Astronomy and Astrophysics, volume 528A, 151-151 (2011/4-1)

Exploring the origin of magnetic fields in massive stars: a survey of O-type stars in clusters and in the field.

HUBRIG S., SCHOELLER M., KHARCHENKO N.V., LANGER N., DE WIT W.J., ILYIN I., KHOLTYGIN A.F., PISKUNOV A.E., PRZYBILLA N. (The MAGORI Collaboration)

Abstract (from CDS):

Although the effects of magnetic fields in massive stars have been found to be substantial by recent models and observations, the magnetic fields of only a small number of massive O-type stars have so far been investigated. Additional observations are of the utmost importance to constraining the conditions that are conducive to magnetic fields and to determine the first trends about their occurrence rate and field strength distribution. To investigate statistically whether magnetic fields in massive stars are ubiquitous or appear only in stars with a specific spectral classification, certain ages, or in a special environment, we acquired 41 new spectropolarimetric observations for 36 stars. Among the observed sample, roughly half of the stars are probable members of clusters at different ages, whereas the remaining stars are field stars not known to belong to any cluster or association. Spectropolarimetric observations were obtained during three different nights using the low-resolution spectropolarimetric mode of FORS2 (FOcal Reducer low dispersion Spectrograph) mounted on the 8-m Antu telescope of the VLT. To assess the membership in open clusters and associations, we used astrometric catalogues with the highest quality kinematic and photometric data currently available. A field at a significance level of 3σ was detected in ten O-type stars. The strongest longitudinal magnetic fields were measured in two Of?p stars: <Bz≥-381±122G for CPD-282561 and <Bz≥-297±62G for HD148937, the latter of which had previously been detected by ourselves as magnetic. The observations of HD148937 obtained on three different nights indicate that the magnetic field is slightly variable. Our new measurements support our previous conclusion that large-scale organized magnetic fields with polar field strengths in excess of 1kG are not widespread among O-type stars. Among the stars with a detected magnetic field, only one star, HD156154, belongs to an open cluster at high membership probability. According to previous kinematic studies, four magnetic O-type stars in the sample are well-known candidate runaway stars.

Abstract Copyright:

Journal keyword(s): polarization - stars: magnetic field - stars: kinematics and dynamics - open clusters and associations: general - stars: early-type

Simbad objects: 72

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Number of rows : 72
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 108 SB* 00 06 03.3890541936 +63 40 46.771220928 6.79 7.58 7.40     O4-8f?p 315 0
2 NGC 1624 OpC 04 40 36.0 +50 27 42     11.8     ~ 68 1
3 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1693 0
4 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.45 4.68   4.88 O7V+B1.5/2V 777 0
5 CD-28 5104 s*b 07 55 52.8512069760 -28 37 46.791254424 9.39 10.13 9.94 10.12   O6Ifp 77 0
6 CD-47 4551 s*b 08 57 54.6180604176 -47 44 15.708893424 9.11 9.41 8.54 8.92   O5Ifc 70 0
7 HD 93128 SB* 10 43 54.3957741024 -59 32 57.497266716 8.82 8.97 8.77 9.40 8.71 O3.5V((fc))z 94 1
8 Cl Trumpler 14 OpC 10 43 57 -59 33.2   5.70 5.5     ~ 471 0
9 HD 93129B * 10 43 57.6453994104 -59 32 53.765064780   10.40 8.84     O3.5V((f)) 65 0
10 HD 93204 * 10 44 32.3390794992 -59 44 31.020804780 7.63 8.52 8.42 8.20 7.92 O5.5V((f)) 180 0
11 HD 303311 SB* 10 44 37.4602634976 -59 32 55.460525100 8.30 9.042 8.979 9.58 9.09 O6V((f))z 78 0
12 Cl Trumpler 16 OpC 10 45 01 -59 42.0   5.35 5.0     ~ 455 0
13 HD 303308 ** 10 45 05.9147911152 -59 40 05.925360036 7.45 8.30 8.17 7.92 7.75 O4.5V((fc)) 288 0
14 HD 93403 SB* 10 45 44.1198371784 -59 24 28.153300860 6.72 8.46 8.27 8.35   O5.5III(fc)var 188 1
15 HD 93843 Er* 10 48 37.7715351864 -60 13 25.518487656 6.37 7.29 7.33 8.23   O5III(fc) 165 0
16 HD 105056 s*b 12 05 49.8804411912 -69 34 22.996270632 6.57 9.07 8.74 8.45   ON9.7Iae 123 1
17 [KPR2005] 69 OpC 12 06 36 -69 46.2           ~ 22 0
18 HD 115455 SB* 13 18 35.3592390638 -62 29 28.407889555 7.40 8.17 7.97 8.81   O8III((f)) 98 1
19 Cl Stock 16 OpC 13 19 26 -62 37.3           ~ 87 0
20 Cl Platais 10 OpC 13 40 53 -59 16.3           ~ 30 0
21 HD 120521 * 13 51 33.9825427488 -58 32 22.270329672 8.06 8.79 8.58 9.33   O7.5Ib(f) 55 0
22 HD 123590 * 14 10 43.9689754248 -62 28 44.450066712 6.93 9.21 8.84 8.68   O8Vz 38 0
23 [KPR2005] 77 OpC 14 10 47 -62 19.9           ~ 15 0
24 HD 125206 * 14 20 09.0397470528 -61 04 54.621382980 7.47 8.18 7.92 8.89   O9.7IVn 64 1
25 HD 125241 V* 14 20 22.7843645064 -60 53 22.245268236 8.60 9.08 8.60 8.95   O8.5Ib(f) 78 0
26 HD 130298 Em* 14 49 33.7650740400 -56 25 38.474619060 9.14 10.06 9.83 9.65   O6.5III(n)(f) 53 0
27 * del Cir SB* 15 16 56.8959099600 -60 57 26.120078136 4.11 5.03 5.09 6.68   O8V 151 0
28 HD 135591 * 15 18 49.1432685384 -60 29 46.795963020 4.46 5.36 5.46 6.91   O8IV((f)) 151 0
29 [KPR2005] 79 OpC 15 18 55 -60 47.9           ~ 26 0
30 HD 148937 SB* 16 33 52.3869185520 -48 06 40.476418740 6.49 7.12 6.71 7.61   O6f?p 371 4
31 HD 328856 * 16 46 33.3553009152 -47 04 50.959695432 8.32 9.95 9.48 9.19 8.485 O9.7II 45 1
32 Cl Hogg 22 OpC 16 46 34 -47 06.2           ~ 66 0
33 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 206 0
34 HD 152233 SB* 16 54 03.5909222280 -41 47 29.841281484 5.93 6.72 6.59     O6II(f) 187 0
35 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 507 0
36 HD 152247 SB* 16 54 11.5173615984 -41 38 30.967835208 6.62 7.35 7.16 8.09   O9.2III 124 0
37 HD 152249 s*b 16 54 11.6395658856 -41 50 57.295111524 5.91 6.65 6.45     OC9Iab 227 0
38 HD 152408 s*b 16 54 58.5051071856 -41 09 03.093075612 5.17 5.92 5.77 7.00   O8Iape 362 0
39 C 1652-407 OpC 16 55 30.00 -40 50 00.0     3.4     ~ 11 0
40 Cl Trumpler 24 OpC 16 57 00 -40 40.0     8.6     ~ 68 0
41 HD 153426 * 17 01 13.0078001616 -38 12 11.886304536 6.79 7.61 7.47 8.49   O8.5III 92 0
42 HD 153919 HXB 17 03 56.7725629224 -37 50 38.913331452 6.06 6.78 6.51 6.08 5.90 O6Iafcp 784 1
43 NGC 6281 OpC 17 04 43 -37 56.9           ~ 116 0
44 HD 154368 s*b 17 06 28.3687759224 -35 27 03.760593156 6.10 6.63 6.13 7.12   O9.5Iab 277 0
45 [KPR2005] 88 OpC 17 07 33 -35 33.8           ~ 27 0
46 HD 154643 SB* 17 08 13.9817547216 -35 00 15.671611152 6.76 7.42 7.20 8.23   O9.7III 49 1
47 HD 154811 * 17 09 53.0865607752 -47 01 53.186262060 6.71 7.32 6.98 7.71   OC9.7Ib 81 0
48 Ass Sco OB 4 As* 17 12.6 -33 22           ~ 43 0
49 HD 155806 Be* 17 15 19.2478670712 -33 32 54.299379012 4.61 5.52 5.53     O7.5V((f))z(e) 218 0
50 Cl Bochum 13 OpC 17 17 20 -35 31.7   7.84 7.2     ~ 55 0
51 HD 156154 V* 17 17 27.0092259048 -35 32 12.001357572 8.19 8.64 8.04 8.94   O7.5Ib(f) 71 0
52 HD 156212 * 17 17 27.5962076424 -27 46 00.805226124 7.91 9.13 8.74 8.80   B0Iab 54 0
53 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13084 0
54 * 9 Sgr Em* 18 03 52.4450051016 -24 21 38.632254012 5.08 5.97 5.97 5.72 5.70 O4V((f))z 530 0
55 HD 315033 * 18 04 23.2279355376 -24 26 16.720588140 8.42 9.02 8.90     B1V 45 0
56 NGC 6530 OpC 18 04 31 -24 21.5           ~ 383 0
57 HD 165319 * 18 05 58.8359515224 -14 11 52.998222768 8.15 8.63 8.04 7.50 7.00 O9.7Ib 70 1
58 [KPR2005] 93 OpC 18 08 13 -22 15.6           ~ 17 0
59 Ass Sgr OB 7 As* 18 14.9 -20 24           ~ 39 0
60 * 16 Sgr SB* 18 15 12.9690278832 -20 23 16.691046360 5.25 6.05 6.02 5.94 5.86 O9.5III 184 0
61 NGC 6604 OpC 18 18 03 -12 14.5           ~ 129 0
62 HD 168075 SB* 18 18 36.0418343184 -13 47 36.449731536 8.62 9.22 8.77 9.45   O7V(n)((f))z 137 0
63 HD 168112 SB* 18 18 40.8671461608 -12 06 23.367244644 8.81 9.21 8.52 9.24   O5III(f) 140 0
64 M 16 OpC 18 18 45 -13 47.5   6.58 6.0     ~ 989 2
65 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1554 0
66 HD 169582 s*b 18 25 43.1466928224 -09 45 11.033442216 8.74 9.24 8.70     O6Iaf 85 0
67 HD 171589 Em* 18 36 12.6382414200 -14 06 55.832938524 7.91 8.60 8.28 7.95 7.74 O7.5II(f) 77 0
68 HD 175754 Em* 18 57 35.7085336776 -19 09 11.264191704 5.99 6.96 7.03     O8II(n)((f))p 143 0
69 V* V3961 Sgr a2* 19 51 50.6106718344 -39 52 27.738309468 5.05 5.27 5.33     ApCr(Si) 176 0
70 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4122 0
71 HD 191612 SB* 20 09 28.6105997664 +35 44 01.286453904 7.40 8.07 7.80     O8fpe 227 0
72 NAME Ara reg ~ ~           ~ 18 0

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2022.08.10-07:34:29

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