Quiescent and Low Luminosity X-Ray Binaries

Physics

Scientific paper

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Chandra Proposal Id #02400819

Scientific paper

The galactic bulge contains many old neutron star and black hole binaries now identified as low luminosity X-ray sources. Observed sources can be persistent at a level of a few mCrab, or transients which peak at 10-200 mCrab and then fade to quiescent levels <0.5 mCrab. Theoretical models, including ADAFs, propeller effects, and thermal surface emission, have been tested on only a handful of sources. We propose Chandra observations of 4 faint low mass binaries, XTE J1710-281, XTE J1743-363, SAX J1747.0-2853, and XTE J1723-376, the first two persistently variable and the second two in apparent quiescence. Observations of 30 ks with ACIS I and S would provide for improved positions, light curves and spectra for the active sources, and at least a flux measurement for the quiescent ones.

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