Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 'Slow' and Fast Rotators among Hypervelocity Stars   We measure the projected rotational velocities of the late B-type
hypervelocity stars HVS7 and HVS8 from high resolution spectroscopy to be 60
+/- 17 km/s and 260 +/- 70 km/s. The 'slow' rotation of HVS7 is in principle
consistent with having originated in a binary system, assuming a high
inclination angle of the stellar rotation axis. However, the fast rotation of
HVS8 is more typical of single B-type stars. HVS8 could have therefore been
ejected by a mechanism other than that proposed by Hills. We also estimate the
effective temperatures and surface gravities for HVS7 and HVS8 and obtain an
additional measurement of their radial velocities. We find evidence in support
of a blue horizontal branch nature for HVS7, and a main sequence nature for
HVS8.

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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas