Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiwavelength Observations of EXO 0748--676 -- II. Emission Line
  Behavior   We present optical and ultraviolet spectra, lightcurves, and Doppler
tomograms of the low-mass X-ray binary EXO 0748-676. Using an extensive set of
15 emission line tomograms, we show that, along with the usual emission from
the stream and ``hot spot'', there is extended non-axisymmetric emission from
the disk rim. Some of the emission and Halpha and beta absorption features lend
weight to the hypothesis that part of the stream overflows the disk rim and
forms a two phase medium. The data are consistent with a 1.35M_sun neutron star
with a main sequence companion and hence a mass ratio q~0.34.

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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con