Recent hubble space telescope results on x-ray novae
RXTE has recently discovered two new optically bright black hole candidates (BHCs): XTE J1859+226 and XTE J1118+480. We observed both with HST/STIS, the first outburst observations of X-ray novae with this instrument. We followed broad band spectral evolution, detected correlated X-ray/UV rapid variability and performed high resolution UV spectroscopy. We present a summary of initial results on the spectral energy distributions observed.