The BOES spectropolarimeter for Zeeman measurements of stellar magnetic fields

TL;DR

The paper introduces the BOES spectropolarimeter, a high-resolution instrument designed for precise measurements of stellar magnetic fields through spectropolarimetric observations, demonstrating its effectiveness on well-studied magnetic stars.

Contribution

A new high-resolution spectropolarimeter (BOES) installed on a 1.8-m telescope, capable of detecting stellar magnetic fields with high precision, and validated through test observations.

Findings

Achieved magnetic field detection accuracy from 2G to tens of gauss.

Successfully measured magnetic fields in well-studied F-B main sequence stars.

Demonstrated high precision in spectropolarimetric measurements.

Abstract

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 (R $\sim$ 60000) spectropolarimetric observations 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 < 8.8^m). The results demonstrate that the instrument has a high precision ability of detecting the fields of these stars with typical accuracies ranged from about 2G to a few tens of gauss.