Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The chromospherically active binary star EI Eridani II. Long-term
  Doppler imaging   Data from 11 years of continuous spectroscopic observations of the active RS
CVn-type binary star EI Eridani - gained at NSO/McMath-Pierce, KPNO/Coude Feed
and during the MUSICOS 98 campaign - were used to obtain 34 Doppler maps in
three spectroscopic lines for 32 epochs, 28 of which are independent of each
other. Various parameters are extracted from our Doppler maps: average
temperature, fractional spottedness, and longitudinal and latitudinal
spot-occurrence functions. We find that none of these parameters show a
distinct variation nor a correlation with the proposed activity cycle as seen
from photometric long-term observations. This suggests that the photometric
brightness cycle may not necessarily be due to just a cool spot cycle. The
general morphology of the spot pattern remains persistent over the whole period
of 11 years. A large cap-like polar spot was recovered from all our images. A
high degree of variable activity was noticed near latitudes of approx. 60-70
degrees where the appendages of the polar spot emerged and dissolved.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph