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C. Markwardt (U. Maryland & NASA/GSFC), J. Swank, T. Strohmayer, T. Kallman (NASA/GSFC)
Serpens X-1 is a bursting low-mass X-ray binary which has shown Fe K line emission in EXOSAT and ASCA observations. The feature had about 60 eV equivalent width and was centered at 6.5-6.6 keV. This suggested that the inner disk region is sometimes the dominant formation region for these relatively luminous persistent sources with low inclination angles. We will present the results of simultaneous RXTE and Chandra HETGS observations of Serpens X-1, obtained June 2000. We observed one burst with both RXTE and Chandra. Based upon our preliminary analysis at the time of this writing, the Fe K line(s) as observed in the average HETGS spectrum were weak or very broad. Any low energy lines (near 1.12~keV) are also very weak.