Understanding the on-off states in CAL 83

Details Understanding the on-off states in CAL 83 Understanding the on-off states in CAL 83

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..239s&link_type=abstract

XMM-Newton Proposal ID #05065301

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Cal 83, Xmm-Newton Proposal 05065301

Scientific paper

CAL 83 is the canonical close-binary supersoft X-ray source and also among the two rare systems to show repeated on/off X-ray states. These systematic changes are anti-correlated with the optical brightness and closely connected to processes occuring at near Eddington accretion rates. We propose an optically triggered XMM monitoring of CAL 83 through one X-ray bright state following its evolution with many short pointings (5 ksec each). This will provide new insight into the yet unknown physical mechanism behind the X-ray on/off states by testing three alternatives: (a) Luminosity changes at constant temperature that indicate a cessation of the shell burning; (b) Temperature changes due to variations of the effective radius of the white dwarf; (c) Absorption, e.g. by a variable wind.

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