58 citations · 193 across the 7 of their papers we have counts for
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Starspot activity of HD 199178. Doppler images from 1994--2017
Thomas Hackman, Iya Ilyin, Jyri J. Lehtinen +4
Context. Studying the spots of late-type stars is crucial for distinguishing between the various proposed dynamo mechanisms believed to be the main cause of starspot activity. For…
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…
Magnetic field topology of the RS CVn star II Pegasi
O. Kochukhov, M. J. Mantere, T. Hackman +1
The dynamo processes in cool active stars generate complex magnetic fields responsible for prominent surface stellar activity and variability at different time scales. For a small…
Doppler images of the RS CVn binary II Pegasi during the years 1994-2002
Lindborg, M., Korpi +8
We publish 16 Doppler imaging temperature maps for the years 1994-2002 of the active RS CVn star II Peg. The six maps from 1999-2002 are based on previously unpublished observation…
Magnetic Doppler imaging of the roAp star HD 24712
T. Lüftinger, O. Kochukhov, T. Ryabchikova +3
We present the first magnetic Doppler images of a rapidly oscillating Ap (roAp) star. We deduce information about magnetic field geometry and abundance distributions of a number of…