Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blazhko Effect in Double Mode Cepheids   Systematic survey for multiperiodicity in the LMC Cepheids (Moskalik,
Kolaczkowski & Mizerski 2004, 2006) has led to discovery of several new forms
of pulsational behaviour. One of them is periodic amplitude and phase
modulation observed in many first/second overtone (FO/SO) double mode Cepheids.
In the current paper we present detailed discussion of this newly discovered
phenomenon, based on a combined OGLE+MACHO sample of double mode pulsators.

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The categories of this paper are: hep-ph
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The categories of this paper are: math
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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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-bio
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph