Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Delta Scuti Stars in Stellar Systems: the interest of HD 220392 and HD
  220391   The very wide double star CCDM 23239-5349 is an interesting study case of a
pulsating star within a common origin pair or wide binary. Both stars are
located in the Delta Scuti instability strip. Based on data obtained at La
Silla (Chile), at the Swiss 0.7m and the ESO 0.5m telescopes, we found two
periodicities of about 4.7 and 5.5 cycles per day (cpd) with amplitudes of
0.014 and 0.011 mag, respectively, for HD 220392, the brightest member of the
system. The most dominant periodicity was also detected in the Hipparcos Epoch
Photometry data. A similar period search on the (smaller) dataset obtained for
the 1 mag fainter B-component, HD 220391, however shows no periodic behaviour
with an amplitude significantly above the noise level of the data (about 0.006
mag).

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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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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: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: econ