J/MNRAS/426/2738 Magnetic properties of ω Ori (Neiner+, 2012)
An investigation of the magnetic properties of the classical Be star
ω Ori by the MiMeS Collaboration.
Neiner C., Grunhut J.H., Petit V., Ud-Doula A., Wade G.A., Landstreet J.,
De Batz B., Cochard F., Gutierrez-Soto J., Huat A.-L.
<Mon. Not. R. Astron. Soc., 426, 2738-2750 (2012)>
=2012MNRAS.426.2738N 2012MNRAS.426.2738N
ADC_Keywords: Stars, Be ; Magnetic fields
Keywords: circumstellar matter - stars: emission line, Be -
stars: individual: omega Ori - stars: magnetic field
Abstract:
One hundred and twenty-five new high-precision spectropolarimetric
observations have been obtained with ESPaDOnS (Eschelle
Spectro-Polarimetric Device for the Observation of Stars) at the
Canada-France-Hawaii Telescope and Narval at Telescope Bernard
Lyot to investigate the magnetic properties of the classical Be star
omega Ori. No Stokes V signatures are detected in our polarimetric data.
Measurements of the longitudinal magnetic field, with a median error
bar of 30G, and direct modelling of the mean least-squares
deconvolved Stokes V profiles yield no evidence for a dipole magnetic
field with polar surface strength greater than ∼80G.
Description:
High-resolution (R∼68000) circular polarization (Stokes V)
spectra of omega Ori were obtained with the ESPaDOnS
spectropolarimeter, mounted on the 3.6-m Canada-France-Hawaii
Telescope (CFHT) in Hawaii, and the Narval spectropolarimeter, mounted
on the 2-m Bernard Lyot Telescope (TBL) in France, as part of the
commissioning ESPaDOnS runs (04BE80, 04BE37 and 04BD51), PI programmes
(Neiner on Narval L062N05 and L072N08, and Landstreet on ESPaDOnS
07BC08) and of the MiMeS project (Wade on ESPaDOnS 08BP13). Six
different epochs of spectropolarimetric data were obtained in 2004,
2007 January, 2007 November, 2008 January, 2008 October and 2009
January that resulted in 125 polarimetric observations.
Objects:
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RA (2000) DE Designation(s)
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05 39 11.15 +04 07 17.2 omega Ori = HR 1934
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 35 Magnetic measurements of ω Ori
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See also:
J/A+A/409/275 : Rotation and magnetic field in omega Ori (Neiner+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Inst Intrument
10- 16 A7 --- Run Run ID
18- 27 A10 "Y-M-D" Date Observation date
29- 36 F8.3 d HJD Heliocentric Julain date of mid exposure
(HJD-2450000)
38 I1 --- N Number of exposures
39 A1 --- --- [x]
40 I1 --- Nc Number of images
41 A1 --- --- [x]
42- 44 I3 s texp Exposure time
46- 50 F5.3 --- Phase [0/1] Potential phase coverage assuming a
period of 1.307d
52- 56 I5 --- S/N Mean S/N achieved in the LSD Stokes V profile
58- 66 E9.4 --- FAP [0/1] False alarm probability as measured from
the observed Stokes V spectrum
68- 70 I3 10-4T Bl Longitudinal field measurement obtained
from Stokes V (Gauss)
72- 74 I3 10-4T e_Bl rms uncertainty on Bl
76- 80 F5.2 --- zBl Significance of the Bl measurements (Bl/e_Bl)
82- 85 I4 10-4T Nl Diagnostic null profile
87- 89 I3 10-4T e_Nl rms uncertainty on Nl
91- 95 F5.2 --- zNl Significance of the Nl measurements (Nl/e_Nl)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Apr-2013