Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variability of Hypervelocity Stars   We present time-series photometry of 11 hypervelocity stars (HVSs) to
constrain their nature. Known HVSs are mostly late-B spectral type objects that
may be either main-sequence (MS) or evolved blue horizontal branch (BHB) stars.
Fortunately, MS stars at these effective temperatures, $T_{eff} \sim$ 12,000 K,
are good candidates for being a class of variable stars known as slowly
pulsating B stars (SPBs). We obtained photometry on four nights at the WIYN 3.5
m telescope, and on six nights on the 2.4 m Hiltner telescope. Using sinusoidal
fits, we constrain four of our targets to have periods between $P \sim 0.2 - 2$
days, with a mean value of 0.6 days. Our amplitudes vary between $A = 0.5 -
3$%. This suggests that these four HVSs are SPBs. We discuss a possible origin
for these stars, and why further observations are necessary.

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The categories of this paper are: nlin
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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: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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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: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas