Modelling X-ray colour-colour changes in Z sources.

Details Modelling X-ray colour-colour changes in Z sources. Modelling X-ray colour-colour changes in Z sources.

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314l..25l&link_type=abstract

Astronomy and Astrophysics, v.314, p.L25-L28

Astronomy and Astrophysics

Astrophysics

Radiation Mechanisms: Thermal, Methods: Statistical, Stars: Neutron, X-Rays: Stars

Scientific paper

We investigate the X-ray colour-colour variations of Z sources. We use a Monte Carlo code to model the scattering of radiation emitted from the hot central corona (HCC) as it passes through a (non-uniform) radially accreting region. We find that the horizontal branch of the Z track of Cyg X-2 can be produced by changes in the radial accretion structure with increasing mass transfer rate. The normal branch however, requires changes in the spectrum emerging from the HCC. The effect of the non-uniform bulk motion of the plasma is shown to be important in determining both the position of the Z track in colour-colour space, and also the extent and orientation of the horizontal branch.

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