English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A method for the determination of integrated longitudinal stellar fields fromlow-resolution spectra is the so-called slope method, which is based on theregression of the Stokes V signal against the first derivative of Stokes I.Here we investigate the possibility to extend this technique to measure themagnetic fields of cool stars from high resolution spectra. For this purpose wedeveloped a multi-line modification to the slope method, called multi-lineslope method. We tested this technique by analysing synthetic spectra computedwith the COSSAM code and real observations obtained with the high resolutionspectropolarimeters Narval, HARPSpol and Catania Astrophysical ObservatorySpectropolarimeter (CAOS). We show that the multi-line slope method is a fastalternative to the Least Squares Deconvolution (LSD) technique for themeasurement of the effective magnetic fields of cool stars. Using a Fouriertransform on the effective magnetic field variations of the star $\epsilon$Eri, we find that the long term periodicity of the field corresponds to the2.95 yr period of the stellar dynamo, revealed by the variation of the activityindex.

monthly notices of the royal astronomical society

The multi-line slope method for the measure of the effective magnetic  field of the cool stars: an application to the solar like cycle of {\epsilon}  Eri