X-ray transfer in binary systems - A Monte Carlo study

Details X-ray transfer in binary systems - A Monte Carlo study X-ray transfer in binary systems - A Monte Carlo study

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..614h&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 1, 1978, p. 614-624.

Astronomy and Astrophysics

Astrophysics

26

Binary Stars, Light Curve, Monte Carlo Method, Radiative Transfer, Stellar Models, X Ray Sources, Companion Stars, Compton Effect, Graphs (Charts), Photoionization, Steady State, Stellar Envelopes, Stellar Occultation, Stellar Winds, X Ray Spectra, X Ray Stars

Scientific paper

Results are presented for Monte Carlo calculations of X-ray light curves for binary systems surrounded by clouds with simple density distributions, chemical compositions, and ionization structures. Occultation of the X radiation by the companion star is taken into account along with Compton scattering and photoionization within the clouds. The models are used to examine the effect of various cloud geometries and ionization structures on the emergent X-ray flux as a function of orbital phase and X-ray energy. The results demonstrate the sensitivity of observed light curves and phase-dependent spectra with respect to the optical depth, geometry, and ionization structure of a surrounding cloud for the cases of a uniform-density cloud with a radius four times the binary orbital separation, a steady-state constant-velocity stellar wind emanating from the companion star, and a spherically symmetric shell or 'cocoon' of the type proposed for Cyg X-3. It is concluded that X-ray binary systems are unlikely to be surrounded by obscuring clouds.

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