Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Mass Ratio Distribution in Main-Sequence Spectroscopic Binaries
  Measured by IR Spectroscopy   We report infrared spectroscopic observations of a large, well-defined sample
of main-sequence, single-lined spectroscopic binaries in order to detect the
secondaries and derive the mass ratio distribution of short-period binaries.
The sample consists of 51 Galactic disk spectroscopic binaries found in the
Carney and Latham high-proper-motion survey, with primary masses in the range
of 0.6--0.85 msun. Our infrared observations detect the secondaries in 32
systems, two of which have mass ratios, q=M_2/M_1, as low as ~0.20. Together
with 11 systems previously identified as double-lined binaries by visible light
spectroscopy, we have a complete sample of 62 binaries, out of which 43 are
double-lined. The mass ratio distribution is approximately constant over the
range q=1.0 to 0.3. The distribution appears to rise at lower q values, but the
uncertainties are sufficiently large that we cannot rule out a distribution
that remains constant. The mass distribution derived for the secondaries in our
sample, and that of the extra-solar planets, apparently represent two distinct
populations.

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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin