Long-term magnetic field monitoring of the Sun-like star Ksi Bootis A

TL;DR

This study presents a long-term magnetic field monitoring of the Sun-like star Ksi Bootis A, revealing its magnetic and activity variations over several years through spectropolarimetric observations.

Contribution

It provides the first detailed long-term magnetic and activity evolution analysis of Ksi Bootis A using phase-resolved spectropolarimetric data.

Findings

Detected rotational modulation of magnetic activity.

Observed long-term evolution of magnetic field and activity tracers.

Reconstructed large-scale magnetic field maps over multiple years.

Abstract

Phase-resolved observations of the solar-type star Ksi Bootis A were obtained using the NARVAL spectropolarimeter at the Telescope Bernard Lyot (Pic du Midi, France) during years 2007, 2008, 2009 and 2010. The data sets enable us to study both the rotational modulation and the long-term evolution of various magnetic and activity tracers. Here, we focus on the large-scale photospheric magnetic field (reconstructed by Zeeman-Doppler Imaging), the Zeeman broadening of the FeI 846.84 nm magnetic line, and the chromospheric CaII H and H alpha emission.