87 citations · 897 across the 36 of their papers we have counts for
5 papers · 1 filter
Activity trends in young solar-type stars
Jyri Lehtinen, Lauri Jetsu, Thomas Hackman +2
We study a sample of 21 young and active solar-type stars with spectral types ranging from late F to mid K and characterize the behaviour of their activity. We apply the continuous…
Zeeman-Doppler imaging of active young solar type stars
Thomas Hackman, Jyri Lehtinen, Lisa Rosén +2
By studying young magnetically active late-type stars, i.e. analogues to the young Sun, one can draw conclusions on the evolution of the solar dynamo. We determine the topology of…
Study of FK Comae Berenices: VII. Correlating photospheric and chromospheric activity
K. Vida, H. Korhonen, I. V. Ilyin +3
We study the connection between the chromospheric and photospheric behaviour of the active late-type star FK Comae. We use spot temperature modelling, light curve inversion based o…
Doppler Imaging of LQ Hya for 1998-2002
E. M. Cole, T. Hackman, M. J. Käpylä +3
We study the spot distribution on the surface of LQ~Hya during the observing seasons October 1998 -- November 2002. We look for persistent active longitudes, trends in the level of…
Stellar activity as noise in exoplanet detection I. Methods and application to solar-like stars and activity cycles
H. Korhonen, J. M. Andersen, N. Piskunov +4
The detection of exoplanets using any method is prone to confusion due to the intrinsic variability of the host star. We investigate the effect of cool starspots on the detectabili…