Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Echo Tomography of Sco X-1 using Bowen Fluorescence Lines   We present preliminary results of a simultaneous X-ray/optical campaign of
the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the
high excitation Bowen/HeII emission lines were obtained through narrow
interference filters with ULTRACAM, and these were cross-correlated with X-ray
lightcurves. We find evidence for correlated variability, in particular when
Sco X-1 enters the Flaring Branch. The Bowen/HeII lightcurves lag the X-ray
lightcurves with a light travel time which is consistent with reprocessing in
the companion star.

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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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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: eess
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th