Continuum optical circular polarisation in the young O star Theta 1 Orionis C?

Astronomy and Astrophysics – Astrophysics

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Instrumentation: Polarimeters, Methods: Observational, Techniques: Polarimetric, Stars: Individual: Theta 1, Ori C Stars: Magnetic Fields, Stars: Early-Type

Scientific paper

Recently, Donati & Wade (1999) have claimed rather spectacular, large, variable circular polarisation in the optical continuum of Theta 1 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.

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