Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-Resolved Ultraviolet Spectroscopy of the SW Sex Star DW UMa:
  Confirmation of a Hidden White Dwarf and the UV Counterpart to Phase 0.5
  Absorption Events   We present time-resolved, ultraviolet (UV) spectroscopy of the SW Sex star DW
UMa in the high state. We confirm that, shortward of 1500 \AA, the high-state,
UV continuum level is lower than the white dwarf (WD)-dominated low-state
level. We also do not see the WD contact phases in the high state eclipse light
curves. These results confirm our earlier finding that the WD in this system is
hidden from view in the high state. Based on this, we caution that eclipse
mapping of high-inclination SW Sex stars in the high state may yield incorrect
or misleading results. In the context of DW UMa, we demonstrate explicitly that
distance estimates obtained by recent eclipse mapping studies cannot be
reconciled with the WD-dominated low-state spectrum. We also show that the
fluxes of the UV emission lines in the high state drop near orbital phase 0.5.
This is the first detection of a UV counterpart to the class-defining phase 0.5
absorption seen in the optical emission lines of SW Sex stars.

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The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc