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

Published online by Cambridge University Press:  07 August 2014

Zsolt Kővári ,
Levente Kriskovics ,
Katalin Oláh ,
Krisztián Vida ,
János Bartus ,
Klaus G. Strassmeier  and
Michael Weber
Zsolt Kővári
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121, Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, bartus@konkoly.hu
Levente Kriskovics
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121, Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, bartus@konkoly.hu
Katalin Oláh
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121, Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, bartus@konkoly.hu
Krisztián Vida
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121, Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, bartus@konkoly.hu
János Bartus
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121, Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, bartus@konkoly.hu
Klaus G. Strassmeier
Affiliation:
Konkoly Observatory, Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: kstrassmeier@aip.de, mweber@aip.de
Michael Weber
Affiliation:
Konkoly Observatory, Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: kstrassmeier@aip.de, mweber@aip.de
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Abstract

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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 (Porb=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 α of 0.05, in agreement with preliminary suggestions from previous attempts. A possible surface pattern of meridional circulation is also detected.

Keywords

stars: activitystars: imagingstars: individual (IL Hya)stars: spotsstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 379 - 380
Copyright
Copyright © International Astronomical Union 2014 

References

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