Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial Velocity Variable sdO/Bs from SPY - Preliminary Orbits of Three
  New Short Period Binaries   We present new results from follow-up time-resolved spectroscopy of radial
velocity variable hot subdwarfs from the SPY project. Medium resolution spectra
were taken at the ESO NTT. Preliminary orbital solutions are presented for
three single-lined sdO/B binaries. The orbital periods of all binaries are
short and the companions are most likely white dwarfs or late main-sequence
stars. Follow-up time-resolved spectroscopy is necessary to measure the orbital
parameters with higher accuracy. Light curves should be taken in order to
search for reflection effects and or eclipses.

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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: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph