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M.M. Buxton, C.D. Bailyn (Yale University)
We present our simultaneous optical and IR observations of black-hole X-ray binaries 4U 1543-47 and GX 339-4. Observations were obtained by the YALO and SMARTS consortia when both objects were declining in soft X-rays. The most interesting feature of the data is a secondary outburst in the optical and IR light curves with no corresponding rise in the ASM X-ray light curve. In the case of 4U 1543-47 a radio detection was made at the peak of the secondary outburst.
A possible source of this optical/IR reflare is synchrotron radiation emitted from a jet. We explore this hypothesis in this poster and compare our results to another black-hole candidate with similar behaviour, XTE J1550-564.
This study is supported by the NSF.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.