4U 2129+47: A Powerful Probe of Quiescent Neutron Star Emission

We propose four XMM observations of 40ksec exposure each of the quiescenteclipsing neutron star 4U2129+47. The summed observations will provide a verydetailed orbital phaseresolved average spectrum. The lightcurve from individualobservations will map out the Xray ephemeris, and the phasefolded lightcurvewill determine the size of the hard Xray emission region. With XMM we willmeasure the hard power law tail, measure or place astrophysically interestinglimits on the size of the hard power law tail emission region, improve thestatistics of the soft Xray spectrum and lightcurve to further test neutronstar atmosphere models, search for evidence that the sinusoidal modulationamplitude has changed, and possibly detect 3rd body orbital modulation of the Xray eclipse. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]