Hotter than Expected: GALEX and HST Results on White Dwarfs in Cataclysmic Variables

Details Hotter than Expected: GALEX and HST Results on White Dwarfs in Cataclysmic Variables Hotter than Expected: GALEX and HST Results on White Dwarfs in Cataclysmic Variables

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372..547s&link_type=abstract

15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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