Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HD 4915: A Maunder Minimum Candidate   We study the magnetic activity cycle of HD 4915 using the \ion{Ca}{2} H \& K
emission line strengths measured by Keck I/HIRES spectrograph. The star has
been observed as a part of California Planet Search Program from 2006 to
present. We note decreasing amplitude in the magnetic activity cycle, a pattern
suggesting the star's entry into a Magnetic Grand Minimum (MGM) state,
reminiscent of the Sun's Maunder and Dalton Minima. We recommend further
monitoring of the star to confirm the grand minimum nature of the dynamo, which
would provide insight into the state of the Sun's chromosphere and the global
magnetic field during its grand minima. We also recommend continued
observations of H \& K emission lines, and ground or space based photometric
observations to estimate the sunspot coverage.

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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: hep-lat