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

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 (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 differenti...

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Veröffentlicht in:Proceedings of the International Astronomical Union 2013-08, Vol.9 (S302), p.379-380
Hauptverfasser: Kővári, Zsolt, Kriskovics, Levente, Oláh, Katalin, Vida, Krisztián, Bartus, János, Strassmeier, Klaus G., Weber, Michael
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
Contributed Papers
Magnetic fields
Spectrum analysis
Star & galaxy formation
Stars & galaxies
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Beschreibung
Zusammenfassung: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.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921314002543