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Astron. Astrophys. 358, 572-574 (2000)
Continuum optical circular polarisation in the young O star ![[FORMULA]](img1.gif)
Orionis C?
A.F.J. Moffat * and
T. Eversberg **
Département de Physique, Université de Montréal, C.P.6128, Succ. Centre Ville, Montréal H3C 3J7, Canada and Observatoire du Mont Mégantic (moffat![[FORMULA]](img2.gif)
astro.umontreal.ca)
Received 29 October 1999 / Accepted 3 February 2000
Abstract
Recently, Donati & Wade (1999) have claimed rather spectacular,
large, variable circular polarisation in the optical continuum of
![[FORMULA]](img3.gif)
Orionis C, obtained with the
échelle spectropolarimeter MuSiCoS. However, based on
experience with the William-Wehlau spectropolarimeter, a similar unit
using two fiber feeds, we suggest that this is the spurious result of
instrumental effects. We propose a remedy to eliminate the effect.
Key words: instrumentation:
polarimeters 
methods:
observational
techniques:
polarimetric
stars: individual: 1 Ori C stars: magnetic
fields
stars: early-type
* Killam Fellow of the Canada Council for the Arts
** now at Leibnizstraße 37, 30827 Garbsen, Germany (T_Eversbergfeinfocus.com)
Send offprint requests to: A.F.J. Moffat
Contents
© European Southern Observatory (ESO) 2000
Online publication: June 8, 2000
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