Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial Velocity Studies of Close Binary Stars. XII   Radial-velocity measurements and sine-curve fits to the orbital radial
velocity variations are presented for ten close binary systems: OO Aql, CC Com,
V345 Gem, XY Leo, AM Leo, V1010 Oph, V2612 Oph, XX Sex, W UMa, and XY UMa. Most
of these binaries have been observed spectroscopically before, but our data are
of higher quality and consistency than in the previous studies.
  While most of the studied eclipsing pairs are contact binaries, V1010 Oph is
probably a detached or semi-detached double-lined binary and XY UMa is a
detached, chromospherically active system whose broadening functions clearly
show well defined and localized dark spots on the primary component. A
particularly interesting case is XY Leo, which is a member of visually
unresolved quadruple system composed of a contact binary and a detached,
non-eclipsing, active binary with 0.805 days orbital period. V345 Gem and AM
Leo are known members of visual binaries. We found faint visual companions at
about 2-3 arcsec from XX Sex and XY UMa.

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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat