2014A&A...567A..28A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:40:43

2014A&A...567A..28A - Astronomy and Astrophysics, volume 567A, 28-28 (2014/7-1)

Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey.

ALECIAN E., KOCHUKHOV O., PETIT V., GRUNHUT J., LANDSTREET J., OKSALA M.E., WADE G.A., HUSSAIN G., NEINER C., BOHLENDER D. (The MiMeS Collaboration)

Abstract (from CDS):

The Magnetism in Massive Stars (MiMeS) project aims at understanding the origin of the magnetic fields in massive stars as well as their impact on stellar internal structure, evolution, and circumstellar environment. One of the objectives of the MiMeS project is to provide stringent observational constraints on the magnetic fields of massive stars; however, identification of magnetic massive stars is challenging, as only a few percent of high-mass stars host strong fields detectable with the current instrumentation. Hence, one of the first objectives of the MiMeS project was to search for magnetic objects among a large sample of massive stars, and to build a sub-sample for in-depth follow-up studies required to test the models and theories of fossil field origins, magnetic wind confinement and magnetospheric properties, and magnetic star evolution. We obtained high-resolution spectropolarimetric observations of a large number of OB stars thanks to three large programs (LP) of observations that have been allocated on the high-resolution spectropolarimeters ESPaDOnS, Narval, and the polarimetric module HARPSpol of the HARPS spectrograph. We report here on the methods and first analysis of the HARPSpol magnetic detections. We identified the magnetic stars using a multi-line analysis technique. Then, when possible, we monitored the new discoveries to derive their rotation periods, which are critical for follow-up and magnetic mapping studies. We also performed a first-look analysis of their spectra and identified obvious spectral anomalies (e.g., surface abundance peculiarities, Hα emission), which are also of interest for future studies. In this paper, we focus on eight of the 11 stars in which we discovered or confirmed a magnetic field from the HARPSpol LP sample (the remaining three were published in a previous paper). Seven of the fields were detected in early-type Bp stars, while the last field was detected in the Ap companion of a normal early B-type star. We report obvious spectral and multiplicity properties, as well as our measurements of their longitudinal field strengths, and their rotation periods when we are able to derive them. We also discuss the presence or absence of Hα emission with respect to the theory of centrifugally-supported magnetospheres.

Abstract Copyright:

Journal keyword(s): stars: massive - stars: magnetic field - stars: chemically peculiar

VizieR on-line data: <Available at CDS (J/A+A/567/A28): list.dat mask1.dat mask2.dat mask3.dat mask4.dat mask5.dat mask6.dat mask7.dat mask8.dat mask9.dat>

Simbad objects: 22

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Number of rows : 22

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 HD 66765 ** 08 02 55.7163496590 -48 19 29.954389324 5.69 6.470 6.624     B1/2V 33 0
2 HD 67621 * 08 06 41.6075233060 -48 29 50.594312577 5.31 6.143 6.317     B2IV 39 0
3 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 210 0
4 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 839 0
5 HD 96446 Pu* 11 06 05.8217576741 -59 56 59.536118851 5.81 6.57 6.69     B2IIIp 149 0
6 HD 105382 Be* 12 08 05.2252130502 -50 39 40.576542564 3.65 4.32 4.47 4.53 4.70 B3/5III 150 0
7 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 354 1
8 HD 107947 * 12 24 51.9182757800 -72 36 14.032224551   6.606 6.603     A0V 32 0
9 HD 109029 PM* 12 31 30.7733817539 +33 00 54.106108359   7.83 7.4     F4 30 0
10 * gam Mus Pu* 12 32 28.0134336 -72 07 58.759701 3.12 3.73 3.88 3.91 4.08 B3V 135 0
11 * phi Cen V* 13 58 16.2668006 -42 06 02.714311 2.79 3.608 3.802     B2IV 131 0
12 * bet Cen bC* 14 03 49.40535 -60 22 22.9266   0.38 0.60     B1III 338 0
13 * omi Lup ** 14 51 38.3028905 -43 34 31.296546 3.59 4.164 4.313     B5IV 106 1
14 * bet Lup PM* 14 58 31.92536 -43 08 02.2699 1.59 2.46 2.68 2.78 2.95 B2III 177 0
15 HD 133518 * 15 06 55.9722559425 -52 01 47.238970853 5.57 6.29 6.39     B2IVpHe 86 0
16 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 358 1
17 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
18 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
19 HD 147932 Ro* 16 25 35.0836168833 -23 24 18.788751256 7.24 7.59 7.27     B5V 103 0
20 Ass Sco OB 4 As* 17 12.6 -33 22           ~ 39 0
21 CCDM J17184-3224AB ** 17 18 23.4196758445 -32 24 14.525923986 8.28 8.86 8.81 9.49   B2V 24 0
22 HD 156424 * 17 18 54.5497 -32 20 44.674 8.17 8.87 8.90     B2Ib/II 21 0

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2020.07.04-01:40:43

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