GALEX and Optical Light Curves of EF Eridanus During a Low State: the Puzzling Source of UV Light

Details GALEX and Optical Light Curves of EF Eridanus During a Low State: the Puzzling Source of UV Light GALEX and Optical Light Curves of EF Eridanus During a Low State: the Puzzling Source of UV Light

2006-06-21

arxiv.org/abs/astro-ph/0606537v1

Astrophys.J.646:L147-L150,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures to be published in ApJ Letters

Scientific paper

10.1086/507072

Low state optical photometry of EF Eri during an extended low accretion state combined with GALEX near and far UV time-resolved photometry reveals a source of UV flux that is much larger than the underlying 9500K white dwarf, and that is highly modulated on the orbital period. The near UV and optical light curves can be modeled with a 20,000K spot but no spot model can explain both the large amplitude FUV variations and the SED. The limitations of limb darkening, cyclotron and magnetic white dwarf models in explaining the observations are discussed.

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