Strongly absorbed quiescent X-ray emission from the X-ray transient XTE   J0421+56
  We have observed the soft X-ray transient XTE J0421+56 in quiescence with XMM-Newton. The observed spectrum is highly unusual being dominated by a broad feature at 6.5 keV and can be modeled by a strongly absorbed continuum. The spectra of X-ray transients observed so far are normally modeled using Advection Dominated Accretion Flow models, black-bodies, power-laws, or by the thermal emission from a neutron star surface. The strongly absorbed X-ray emission of XTE J0421+56 could result from the compact object being embedded within the dense circumstellar wind emitted from the supergiant B[e] companion star. 
L. Boirin (1, 2), A.N. Parmar (1), D. Lumb (1), M. Orlandini (3) and   N. Schartel (4) ((1) ESA, ESTEC, Noodwijk, The Nether...