The M15 X-ray source X2127+119 - A touchstone for accretion disc coronae

We are proposing to use the eclipses of the Xray source X2127+119 to probe thestructure of Xray binaries. We have chosen this source because it has severalunique advantages, including a well determined distance, metallicity, andfavorable optical magnitude. However, the results from the study should beapplicable to all Xray binaries. We have already been allocated 18 HST orbitsfor this study, which will allow us to determine the structure of the outer discand wind, and are applying here for the data which will determine the nature ofthe Xray emitting regions, especially inner disc and accretion disc corona. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]