High Resolution Spectroscopy of YY Gem

PV YY Gem is a close, fully eclipsing binary dMe binary with a period of 0.81d.Both the primary and the secondary eclipses show deep Xray minima. At adistance of 71 arcsec, the quadruple system of Castor A+B is another Xraysource. This observation will be used to perform i) phase resolved spectroscopyduring a 1 d period; eclipses, flares and rotational modulation will bespectroscopically monitored and modeled; and ii) to perform RGS spectroscopy oftwo sources separated by 71 arcsec. We request position angle constraintsdisplacing the sources along the RGS crossdispersion direction. The pn camerawill use the SML window/thick filter mode to block optical contamination fromCastor A+B. One MOS will be optimized for the detection of Castor A+B. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]