The BOES Spectropolarimeter for Zeeman Measurements of Stellar Magnetic Fields

We introduce a new polarimeter installed on the high-resolution fiber-fed echelle spectrograph (called BOES) of the 1.8 m telescope at the Bohyunsan Optical Astronomy Observatory, Korea. The instrument is intended to measure stellar magnetic fields with high-resolution ( ) spectropolarimetric observations R ∼ 60,000 of intrinsic polarization in spectral lines. In this paper we describe the spectropolarimeter and present test observations of the longitudinal magnetic fields in some well-studied F-B main-sequence magnetic stars (m ! v ). The results demonstrate that the instrument is able to detect the fields of these stars with high precision, 8.8 mag with typical accuracies ranging from about 2 to a few tens of gauss.

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