Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discover of the "missing" mode in HR 1217 by the Whole Earth Telescope   HR 1217 is a prototypical rapidly oscillating Ap star that has presented a
test to the theory of nonradial stellar pulsation. Prior observations showed a
clear pattern of five modes with alternating frequency spacings of 33.3 microHz
and 34.6 microHz, with a sixth mode at a problematic spacing of 50.0 microHz
(which equals 1.5 times 33.3 microHz) to the high-frequency side. Asymptotic
pulsation theory allowed for a frequency spacing of 34 microHz, but Hipparcos
observations rule out such a spacing. Theoretical calculations of
magnetoacoustic modes in Ap stars by Cunha (2001) predicted that there should
be a previously undetected mode 34 microHz higher than the main group, with a
smaller spacing between it and the highest one. In this Letter, we present
preliminary results from a multi-site photometric campaign on the rapidly
oscillating Ap star HR 1217 using the "Whole Earth Telescope". While a complete
analysis of the data will appear in a later paper, one outstanding result from
this run is the discovery of a newly detected frequency in the pulsation
spectrum of this star, at the frequency predicted by Cunha (2001).

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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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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: nucl-ex