The Origin of CAL 83 X-Ray Off-States

Details The Origin of CAL 83 X-Ray Off-States The Origin of CAL 83 X-Ray Off-States

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop...26l&link_type=abstract

XMM-Newton Proposal ID #05008601

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Cal 83, Xmm-Newton Proposal 05008601

Scientific paper

The close binary supersoft X-ray source CAL 83 is a most promising candidate of SN Ia progenitors. Our XMM-Newton and Chandra observations show a massive white dwarf, exhibit large amplitude short-term variations of the X-ray flux, and establish definitively its recurrent nature. We propose now to conduct a campaign with EPIC and OM on XMM-Newton to substantiate the correlation between X-ray and optical variations on a short, medium, and long-term basis. This campaign will trace the physical relation between the accretion disk and the white dwarf, and will discriminate between several models explaining the origin of CAL 83 off-states. XMM-Newton data will offer unique and timely insights into accretion and unstable nuclear burning during the last evolution stages of SN Ia progenitors.

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