289 citations · 895 across the 26 of their papers we have counts for
24 papers · 1 filter
Characterising the stellar differential rotation based on largest-spot statistics from ground-based photometry
Mikko Tuomi, Jyri J. Lehtinen, Gregory W. Henry +1
Stellar spot distribution has consequences on the observable periodic signals in long-time baseline ground-based photometry. We model the statistics of the dominating spots of two…
From convective stellar dynamo simulations to Zeeman-Doppler images
Thomas Hackman, Oleg Kochukhov, Mariangela Viviani +3
Zeeman-Doppler imaging (ZDI) is used to reconstruct the surface magnetic field of late-type stars from high resolution spectropolarimetric observations. The results are usually des…
V889 Her: abrupt changes in the magnetic field or differential rotation?
Teemu Willamo, Thomas Hackman, Jyri J. Lehtinen +2
We have applied Zeeman-Doppler imaging (ZDI) to an extensive spectropolarimetric HARPSpol data set of the magnetically active young solar analogue V889 Her, covering 35 spectra obt…
A Knee-Point in the Rotation-Activity Scaling of Late-type Stars with a Connection to Dynamo Transitions
Jyri J. Lehtinen, Maarit J. Käpylä, Nigul Olspert +1
The magnetic activity of late-type stars is correlated with their rotation rates. Up to a certain limit, stars with smaller Rossby numbers, defined as the rotation period divided b…
Common dynamo scaling in slowly rotating young and evolved stars
Jyri J. Lehtinen, Federico Spada, Maarit J. Käpylä +2
One interpretation of the activity and magnetism of late-type stars is that these both intensify with decreasing Rossby number up to a saturation level, suggesting that stellar dyn…
Hidden magnetic fields of young suns
O. Kochukhov, T. Hackman, J. J. Lehtinen +1
Global magnetic fields of active solar-like stars are nowadays routinely detected with spectropolarimetric measurements and are mapped with Zeeman-Doppler imaging (ZDI). However, d…