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Astron. Astrophys. 358, 572-574 (2000)

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Continuum optical circular polarisation in the young O star [FORMULA] 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]astro.umontreal.ca)

Received 29 October 1999 / Accepted 3 February 2000


Recently, Donati & Wade (1999) have claimed rather spectacular, large, variable circular polarisation in the optical continuum of [FORMULA] 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_Eversberg[FORMULA]feinfocus.com)

Send offprint requests to: A.F.J. Moffat

© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000