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Surface differential rotation of IL Hya from time-series Doppler images

We present a time-series Doppler imaging study of the K-subgiant component in the RS CVn-type binary system IL Hya (P orb=12.905 d). From re-processing the unique long-term spectroscopic dataset of 70 days taken in 1996/97, we perform a thorough cross-correlation analysis to derive surface differential rotation. As a result we get solar-type differential rotation with a shear value alpha of 0.05, in agreement with preliminary suggestions from previous attempts. A possible surface pattern of meridional circulation is also detected.

preprint2013arXivOpen access
Zsolt KőváriLevente KriskovicsKatalin OláhKrisztián VidaJános BartusKlaus G. StrassmeierMichael Weber
astro-ph.SR
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Open access7 authors1 topic
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Zsolt KőváriLevente KriskovicsKatalin OláhKrisztián VidaJános BartusKlaus G. StrassmeierMichael Weber

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