Linking chromospheric activity and magnetic field properties for late-type dwarf stars

ABSTRACT Spectropolarimetric data allow for simultaneous monitoring of stellar chromospheric $\log {R^{\prime }_{\rm {HK}}}$ activity and the surface-averaged longitudinal magnetic field, Bl, giving opportunity to probe relationship between large-scale fields manifestations magnetism. We present and/or Bl measurements 954 mid-F mid-M stars derived from spectropolarimetric observations contained within PolarBase database. Our magnetically active sample complements previous surveys that focus on inactive planet-search targets. find a positive correlation mean log |Bl|, but G may undergo change {HK}}}\sim -4.4$ −4.8. The shows similar with respect variability amplitude intermediately stars. also combine our results archival published field geometries using Zeeman–Doppler Imaging. indicate slight under-density late-F early-K $-4.75\le \log HK}}\le -4.5$. This is not as prominent original Vaughan–Preston gap, we do detect under-populated regions in distributions or HK}}$ amplitudes. Chromospheric activity, variability, toroidal strength decrease main sequence rotation slows. For stars, disappearance dominant occurs at level relationships strength.