Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-period eclipsing binaries: towards the true mass-luminosity
  relation. I. The test sample, observations and data analysis   The mass-luminosity relation is a fundamental law of astrophysics. We have
suggested that the currently used mass-luminosity relation is not correct for
the M/M_sun > 2.7 range of mass since it was created using double-lined
eclipsing binaries, where the components are synchronized and consequently
change each other's evolutionary path. To exclude this effect we have started a
project to study long-period massive eclipsing binaries in order to construct
radial velocity curves and determine masses for the components. We outline our
project and present the selected test sample together with the first HRS/SALT
spectral observations and the software package, FBS (Fitting Binary Stars),
that we developed for the analysis of our spectral data. As the first result we
present the radial velocity curves and best-fit orbital elements for the two
components of the FP Car binary system from our test sample.

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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: stat