Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Period-luminosity relationship for SX Phoenicis stars in Galactic
  globular clusters   We compiled a list of about 250 SX Phoenicis stars known in Galactic globular
clusters in order to study period-luminosity relation for this type of
variable. The absolute magnitudes of these stars are derived using
metallicity-luminosity calibration for RR Lyrae stars. The mixture of different
radial and non-radial modes present in SX Phoenicis stars and the lack of
unique method of mode identification cause the difficulties in defining strict
period-luminosity relation. As a solution we propose to use confirmed
double-mode radial pulsators.

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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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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: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys