Surface differential rotation of IL Hya from time-series Doppler images. Issue Volume 9:Issue S302(2013) (7th August 2014)

• Record Type: Journal Article
• Authors: Kővári, Zsolt; Kriskovics, Levente; Oláh, Katalin; Vida, Krisztián; Bartus, János; Strassmeier, Klaus G.; Weber, Michael
• Editors: Petit, Pascal; Jardine, Moira; Spruit, Hendrik C.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 9:Issue S302(2013)
• Page Start: 379
• Page End: 380
• Publication Date: 2014-08-07
• Subjects: stars: activity, -- stars: imaging, -- stars: individual (IL Hya), -- stars: spots, -- stars: late-type; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921314002543
• Languages: English
• ISSNs: 1743-9213

Abstract

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