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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
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Knigge, Christian , Araujo-Betancor, Sofia , Gänsicke, B. T. (Boris T.), Long, Knox S., Szkody, Paula, Hoard, D. W. (Donald Wayne), Hynes, R. I. and Dhillon, V. S. (2004) 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. Astrophysical Journal, Volume 615 (Number 2 Part 2). L129-L132. doi:10.1086/426118 ISSN 0004-637X.
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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 Angstrom, 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.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astrophysical Journal | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0004-637X | ||||
| Official Date: | 2004 | ||||
| Dates: |
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| Volume: | Volume 615 | ||||
| Number: | Number 2 Part 2 | ||||
| Number of Pages: | 4 | ||||
| Page Range: | L129-L132 | ||||
| DOI: | 10.1086/426118 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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