GBS-discovered quiescent X-ray binaries: XMM eclipse duration and VLT spectra

We propose to use XMM to observe eclipsing probable quiescent lowmass Xraybinaries selected from the Galactic Bulge Survey. The XMM data are crucial todetermine the eclipsing duration, one cannot do this as accurately from opticallight curves because optical emission regions tend to be virgul1/3 of the orbitalseparation whereas Xray emission regions only 1/100th, making Xray eclipsessharp while optical eclipses are fuzzy... Using the XMM eclipse duration andthe VLT spectroscopy we can determine virtually model independent masses of thecompact objects. Furthermore, we may select different mass ratio systemsfavoring lowmass black holes. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]