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Published August 1, 2006 | Version Published
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Galex and optical light curves of EF Eridanus during a low state: The puzzling source of ultraviolet light

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Abstract

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 9500 K white dwarf and that is highly modulated on the orbital period. The near-UV and optical light curves can be modeled with a 20,000 K 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.

Additional Information

© 2006 The American Astronomical Society. Received 2006 April 21; accepted 2006 June 21; published 2006 July 21. Support for this research was provided by NASA GALEX grant NNG05GG46G.

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Eprint ID
5620
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CaltechAUTHORS:SZKapjl06

Related works

Describes
http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v646n2/20669/brief/20669.abstract.html (URL)

Funding

NASA
NNG05GG46G

Dates

Created
2006-10-26
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Updated
2020-03-09
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