EF Eridani in the low state

Details EF Eridani in the low state EF Eridani in the low state

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...86w&link_type=abstract

XMM-Newton Proposal ID #06522901

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Ef Eridani

Scientific paper

The polar EF Eridani (2A 0311-227) was once one of the brightest soft X-ray sources in the sky. For the past decade it has been in an extended inactive state (with the exception of occasional short "burps"). We seek to study the residual X-ray activity in this system. The data suggest that the residual optical activity occurs either on the irradiated surface of the substellar mass companion or in a coupling region where the secondary's wind and/or its magnetic field interacts with the megaGauss field of the white dwarf. X-ray observations will provide important clues to the magnetic geometry of polars, and the physics of the coupling region.

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