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Title:
Time-resolved Ultraviolet Spectroscopy of the SW Sex Star DW UMa: Confirmation of a Hidden White Dwarf and the Ultraviolet Counterpart to Phase 0.5 Absorption Events
Authors:
Knigge, Christian; Araujo-Betancor, Sofia; Gänsicke, Boris T.; Long, Knox S.; Szkody, Paula; Hoard, D. W.; Hynes, R. I.; Dhillon, V. S.
Affiliation:
AA(School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK; ), AB(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; ), AC(Department of Physics, University of Warwick, Coventry CV4 7AL, UK; ), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; ), AE(Department of Astronomy, University of Washington, Stevens Way, Box 351580, Seattle, WA 98195; ), AF(Spitzer Science Center, California Institute of Technology, Mail Code 220-6, 1200 East California Boulevard, Pasadena, CA 91125; ), AG(Department of Astronomy and McDonald Observatory, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712; ), AH(Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK; )
Publication:
The Astrophysical Journal, Volume 615, Issue 2, pp. L129-L132. (ApJL Homepage)
Publication Date:
11/2004
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Individual: Constellation Name: DW Ursae Majoris
DOI:
10.1086/426118
Bibliographic Code:
2004ApJ...615L.129K

Abstract

We present time-resolved ultraviolet (UV) spectroscopy of the SW Sex star DW UMa in the high state. We confirm that shortward of 1500 Å, 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. On the basis of 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.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555.

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