Differential rotation of LQ Hya and IL Hya from a time-series of Doppler images

Zs Kövári, M. Weber, K. G. Strassmeier

Research output: Contribution to journalConference article


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.

Original languageEnglish
Pages (from-to)731-734
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number560 II
Publication statusPublished - Aug 26 2005
Event13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany
Duration: Jul 5 2004Jul 9 2004



  • Stars: activity of
  • Stars: imaging
  • Stars: individual: IL Hya
  • Stars: individual: LQ Hya
  • Stars: latetype
  • Starspots

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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