Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..922w&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
1
Hd 81410, Differential Rotation, Doppler Imaging, Starspot
Scientific paper
We re-determined the differential rotation law at the surface of the K giant IL Hydrae (Prot≈12.9 days). Using new NSO and KPNO spectra covering five consecutive rotations in 1996 and two rotations 15 days apart in 2000, we cross-correlate three independent Doppler images from 1996 and two from 2000. Assuming a solar-like differential rotation law, we derive α=Ω1/Ω0≈ -0.047 and 1/ΔΩ≈277 days. This is more than double the solar value of 120 days and in the opposite direction, i. e. the polar regions rotate faster than the equatorial regions. This result is in contrast to earlier measurements showing a weak differential rotation in the same direction as the Sun, but based on only two Doppler images taken one year apart. This indicates, that average spot lifetimes on IL Hya are on the order of a few stellar rotations.
Strassmeier Klaus G.
Washuettl Albert
Weber Matthias
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