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

J\'anos Bartus; Katalin Ol\'ah; Klaus G. Strassmeier; Kriszti\'an Vida; Levente Kriskovics; Michael Weber; Zsolt K\H{o}v\'ari

arxiv: 1309.1378 · v1 · pith:G3DSWZDVnew · submitted 2013-09-05 · 🌌 astro-ph.SR

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

Zsolt K\H{o}v\'ari , Levente Kriskovics , Katalin Ol\'ah , Kriszti\'an Vida , J\'anos Bartus , Klaus G. Strassmeier , Michael Weber This is my paper

classification 🌌 astro-ph.SR

keywords differentialrotationsurfacedopplertime-seriesagreementalphaanalysis

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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.

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

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