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Continuum optical circular polarisation in the young O star Orionis C?
A.F.J. Moffat * and
T. Eversberg **
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 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
Send offprint requests to: A.F.J. Moffat
Online publication: June 8, 2000