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• W3103803463 abstract "We have observed the X-ray transient XTE J0421+56 in quiescence with XMM-Newton. The observed spectrum is highly unusual being dominated by an emission feature at ~6.5 keV. The spectrum can be fit using a partially covered power-law and Gaussian line model, in which the emission is almost completely covered (covering fraction of ) by neutral material and is strongly absorbed with an of () 1023 atom cm-2. This absorption is local and not interstellar. The Gaussian has a centroid energy of keV, a width keV and an equivalent width of eV. It can be interpreted as fluorescent emission line from iron. Using this model and assuming XTE J0421+56 is at a distance of 5 kpc, its 0.5–10 keV luminosity is erg s-1. The Optical Monitor onboard XMM-Newton indicates a V magnitude of . The spectra of X-ray transients in quiescence are normally modeled using advection dominated accretion flows, power-laws, or by the thermal emission from a neutron star surface. The strongly locally absorbed X-ray emission from XTE J0421+56 is therefore highly unusual and could result from the compact object being embedded within a dense circumstellar wind emitted from the supergiant B[e] companion star. The uncovered and unabsorbed component observed below 5 keV could be due either to X-ray emission from the supergiant B[e] star itself, or to the scattering of high-energy X-ray photons in a wind or ionized corona, such as observed in some low-mass X-ray binary systems." @default.
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• W3103803463 date "2002-10-01" @default.
• W3103803463 modified "2023-10-18" @default.
• W3103803463 title "Strongly absorbed quiescent X-ray emission from the X-ray transient XTE J0421+56 (CI Cam) observed with XMM-Newton" @default.
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• W3103803463 doi "https://doi.org/10.1051/0004-6361:20021089" @default.
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