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Hotter than expected : GALEX and HST results on White Dwarfs in cataclysmic variables
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Szkody, Paula, Gaensicke, B. T., Harrison, T. E., Howell, S. B., Mukadam, Anjum S., Nitta, A., Plotkin, Richard M., Sion, Edward M., Solheim, J. -E., Warner, B., Woudt, P. A., Bianchi, L. and Seibert, M. (2007) Hotter than expected : GALEX and HST results on White Dwarfs in cataclysmic variables. In: 15th European Workshop on White Dwarfs, Leicester, 7-11 Aug 2006. Published in: White dwarf. Proceedings, 15th European Workshop, Volume 372 p. 547. ISBN 9781583812396 . doi:10.1063/1.3527872 ISSN 0094-243X.
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Abstract
When accretion rates are very low in cataclysmic variables, the flux emerging from the white dwarf can dominate over that coming from the accretion regions. During the past year, we have used the UV capabilities of GALEX and the SBC on HST to explore the temperatures of white dwarfs in the low accretion rate, short orbital period systems that contain pulsating white dwarfs, and in the extremely low state of the system EF Eri, which contains a highly magnetic white dwarf. The NUV and FUV time-resolved photometry from GALEX, along with ground-based optical data, reveal a source of UV flux from EF Eri that is highly modulated on the orbital period and that is much larger than can be accounted for by the underlying 9500K white dwarf alone. The low resolution UV spectra of three accreting, pulsating white dwarfs reveal high temperatures that lie outside the normal instability strip for field ZZ Ceti stars. It is increasingly clear that accretion at even low levels has a wide variety of effects on the white dwarf.
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | White dwarf. Proceedings, 15th European Workshop | ||||
| Publisher: | Astronomical Society of the Pacific Conference Proceedings | ||||
| ISBN: | 9781583812396 | ||||
| ISSN: | 0094-243X | ||||
| Editor: | Werner, Klaus and Rauch , Thomas | ||||
| Official Date: | 2007 | ||||
| Dates: |
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| Volume: | Volume 372 | ||||
| Page Range: | p. 547 | ||||
| DOI: | 10.1063/1.3527872 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 15th European Workshop on White Dwarfs | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Leicester | ||||
| Date(s) of Event: | 7-11 Aug 2006 |
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