Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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 (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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The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn