2008A&A...483..857S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:00:13

2008A&A...483..857S - Astronomy and Astrophysics, volume 483, 857-867 (2008/6-1)

Magnetic field measurements and wind-line variabilityof OB-type stars.

SCHNERR R.S., HENRICHS H.F., NEINER C., VERDUGO E., DE JONG J., GEERS V.C., WIERSEMA K., VANDALEN B., TIJANI A., PLAGGENBORG B. and RYGL K.L.J.

Abstract (from CDS):

The first magnetic fields in O- and B-type stars that do not belong to the Bp-star class, have been discovered. The cyclic UV wind-line variability, which has been observed in a significant fraction of early-type stars, is likely to be related to such magnetic fields. We attempt to improve our understanding of massive-star magnetic fields, and observe twenty-five carefully-selected, OB-type stars. Of these stars we obtain 136 magnetic field strength measurements. We present the UV wind-line variability of all selected targets and summarise spectropolarimetric observations acquired using the MUSICOS spectropolarimeter, mounted at the TBL, Pic du Midi, between December 1998 and November 2004. From the average Stokes I and V line profiles, derived using the LSD method, we measure the magnetic field strengths, radial velocities, and first moment of the line profiles. No significant magnetic field is detected in any OB-type star that we observed. Typical 1σ errors are between 15 and 200G. A possible magnetic-field detection for the O9V star 10 Lac remains uncertain, because the field measurements depend critically on the fringe-effect correction in the Stokes V spectra. We find excess emission in UV-wind lines, centred about the rest wavelength, to be a new indirect indicator of the presence of a magnetic field in early B-type stars. The most promising candidates to host magnetic fields are the B-type stars δ Cet and 6 Cep, and a number of O stars. Although some O and B stars have strong dipolar field, which cause periodic variability in the UV wind-lines, such strong fields are not widespread. If the variability observed in the UV wind-lines of OB stars is generally caused by surface magnetic fields, these fields are either weak (≲few hundred G) or localised.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: early-type - stars: activity - line: profiles

Simbad objects: 43

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Number of rows : 43

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * gam Peg bC* 00 13 14.1512308 +15 11 00.936759 1.75 2.61 2.84 2.94 3.13 B2IV 660 0
2 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 421 0
3 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 364 0
4 * ksi Per ** 03 58 57.9022917 +35 47 27.713205 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 789 0
5 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 366 0
6 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 635 1
7 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 726 0
8 V* AE Aur Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 524 1
9 * lam Ori A Em* 05 35 08.2792540686 +09 56 02.955355445 2.17 3.48 3.47     O8III((f)) 484 0
10 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1272 1
11 * iot Ori SB* 05 35 25.9819073 -05 54 35.643537 1.45 2.53 2.77     O9IIIvar 729 0
12 * tet02 Ori B Y*O 05 35 26.4004225055 -05 25 00.792538337 5.36 6.29 6.38 6.29 11.050 B2-B5 171 0
13 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 388 1
14 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 457 0
15 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 298 0
16 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.400 4.640   4.88 O7V+B1.5/2V 746 0
17 * 53 Cam a2* 08 01 42.4313674994 +60 19 27.801603076   6.177 6.008     A3VpSrSiCrEu 379 0
18 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1092 1
19 * eta Hya bC* 08 43 13.4749927 +03 23 55.186711 3.380 4.100 4.300 4.37 4.56 B3V 384 1
20 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 807 1
21 * 23 Sex Pu* 10 21 02.0057134197 +02 17 23.007047964 5.9 6.547 6.644     B2IV/V 102 0
22 * rho Leo s*b 10 32 48.6716770 +09 18 23.709445 2.780 3.720 3.870 3.90 4.06 B1Iab 511 0
23 V* DX Cha Ae* 12 00 05.0870448691 -78 11 34.559255151   6.81 6.60     A0_sh 306 0
24 * alf02 CVn a2* 12 56 01.6662171 +38 19 06.154110 2.44 2.76 2.88 2.98 3.05 A0VpSiEu 640 0
25 * alf Vir bC* 13 25 11.57937 -11 09 40.7501 -0.20 0.74 0.97 1.06 1.30 B1V 816 2
26 * ups Her PM* 16 02 47.8971148667 +46 02 12.129177551 4.33 4.616 4.709     B9III 224 0
27 * tau Her Pu* 16 19 44.43666 +46 18 48.1123 3.190 3.73 3.87 4.00 4.16 B5IV 388 0
28 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 854 0
29 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1724 2
30 * iot Her bC* 17 39 27.8860861 +46 00 22.800110 2.940 3.630 3.800     B3IV 430 1
31 V* V2052 Oph bC* 17 56 18.3998830562 +00 40 13.276647618 5.28 5.874 5.820     B3III 197 0
32 * 67 Oph * 18 00 38.7134668813 +02 55 53.595379606 3.34 3.96 3.93 3.84 3.81 B5I 385 0
33 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2505 0
34 * 2 Cyg * 19 24 07.5786267780 +29 37 16.793386618 4.16 4.851 4.977     B3IV 115 1
35 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 880 0
36 HD 191612 SB* 20 09 28.6111448914 +35 44 01.287772714 7.40 8.07 7.80     O8fpe 212 0
37 V* BW Vul bC* 20 54 22.3949148537 +28 31 19.182736153 5.47 6.40 6.54     B2IIIv 284 0
38 * 6 Cep Be* 21 19 22.2202464 +64 52 18.682115 4.56 5.14 5.18     B3IVe 152 0
39 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 683 0
40 * pi.02 Cyg SB* 21 46 47.6083178 +49 18 34.451096 3.4 4.11 4.18     B3III 162 0
41 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 719 0
42 * omi And Be* 23 01 55.2645930 +42 19 33.533383 3.00 3.53 3.62 3.61 3.69 B6IV/V_sh 411 0
43 * 1 Cas * 23 06 36.8178557 +59 25 11.135698 3.93 4.771 4.840     B0.5III 229 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:00:13

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