Differential rotation of LQ Hya and IL Hya from a time-series of Doppler images
Journal article published in 2005 by
Z. Kh ovári,
Z. Kövári 
,
M. Weber,
Strassmeier K ~G,
K. G. Strassmeier
,
M. Weber,
Strassmeier K ~G,
K. G. Strassmeier
Abstract
A technique of detecting differential rotation from time-series Doppler images is introduced and applied to LQ Hya and IL Hya. Fitting the cross-correlation pattern subtracted from a series of cross-correlated consecutive Doppler images, for the rapidly rotating K2 dwarf LQ Hya we find a weak (α = 0.0057) equatorial acceleration. A possible solar-type differential rotation is found on the giant component of the RS CVn-type IL Hya with α = 0.017.