Abstract
Abstract We present calculated fluxes, spectra, and phasograms of the 2.223 MeV line resulting from the capture of neutrons in the atmosphere of the secondary in specific X-ray binary systems. We compare our results with the actual performance characteristics (sensitivities and line widths) of INTEGRAL's spectrometer SPI, as measured after launch. In our model, the neutrons are produced in the accretion disk around the compact primary star and radiated in all directions. We consider reasonable accretion disk models (ADAF, ADIOS) as well as an improved physical model of the atmosphere of the secondary; we also take into account complete elemental compositions (H, He, and CNONe) in both the atmosphere of the secondary and the accretion disk around the compact object, as well as the comptonization of the 2.223 MeV emitted photons. We present results for five nearby X-ray binary sources, namely: A0620-00, XTE J1118+480, Cen X-4, GS 2000+25 and GRO J0422+32.
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