Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision ephemerides for gravitational-wave searches -- III. Revised
  system parameters of Sco X-1   Neutron stars in low-mass X-ray binaries are considered promising candidate
sources of continuous gravitational-waves. These neutron stars are typically
rotating many hundreds of times a second. The process of accretion can
potentially generate and support non-axisymmetric distortions to the compact
object, resulting in persistent emission of gravitational-waves. We present a
study of existing optical spectroscopic data for Sco X-1, a prime target for
continuous gravitational-wave searches, with the aim of providing revised
constraints on key orbital parameters required for a directed search with
advanced-LIGO data. From a circular orbit fit to an improved radial velocity
curve of the Bowen emission components, we derived an updated orbital period
and ephemeris. Centre of symmetry measurements from the Bowen Doppler tomogram
yield a centre of the disc component of 90 km $\mathrm{s^{-1}}$, which we
interpret as a revised upper limit to the projected orbital velocity of the NS
$K_1$. By implementing Monte Carlo binary parameter calculations, and imposing
new limits on $K_1$ and the rotational broadening, we obtained a complete set
of dynamical system parameter constraints including a new range for $K_1$ of
40--90 km $\mathrm{s^{-1}}$. Finally, we discussed the implications of the
updated orbital parameters for future continuous-waves searches.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th