Can INTEGRAL detect 2.223 MeV radiation from X-ray binary sources?

Details Can INTEGRAL detect 2.223 MeV radiation from X-ray binary sources? Can INTEGRAL detect 2.223 MeV radiation from X-ray binary sources?

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587...86g&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 86-90 (2001).

Astronomy and Astrophysics

Astrophysics

X-Ray Binaries, X-Ray Sources, X-Ray Bursts, Radiative Transfer, Scattering, Accretion And Accretion Disks, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

We consider the production of 2.223 MeV radiation resulting from the capture of neutrons in the atmosphere of the secondary in an X-ray binary system, the neutrons being produced in the accretion disk around the compact primary star and radiated in all directions. We have considered several accretion disk models (ADAF, ADIOS, SLE, Uniform-Temperature) and a variety of parameters (accretion rate, mass of the compact object, mass, temperature, and composition of the secondary star, distance between the two objects, etc.). The neutron production rates are calculated by a network of nuclear reactions in the accretion disk, and this is handled by a reaction-rate formulation taking into account the structure equations given by each accretion model. The processes undergone by the neutrons in the atmosphere of the companion star are studied in detail, including thermalization, elastic and inelastic scatterings, absorption, escape from the surface, decay, and capture by protons. The radiative transfer of the 2.22 MeV photons is treated separately, taking into consideration the composition and density of the star's atmosphere. We compute neutron production rates in each model and set of parameters. The final flux of the 2.22 MeV radiation that can be detected from earth is calculated taking into account the distance to the source, the direction of observation with respect to the binary system frame, and the rotation of the source, as this can lead to an observable periodicity in the flux. We have produced spectra of the line, where rotational Doppler shift effects can lead to changes in the spectra that are measurable by INTEGRAL's spectrometer (SPI). .

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