... interpretation

For instance, the fact that the orbital X-ray lightcurve of the wind accreting source GX 301-2 peaks about 0.07 in phase before periastron as a result of wind rotation and stream flows within the system (Leahy 2002).

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... wind

This may be a greater problem in the case of Be stars, whose equatorial outflows are assumed to be denser than in the case of O-type stars. The effect of the orbital eccentricity would make a difference, too.

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... surface

See e.g. Reynolds & Nowak (2002) for a review on fluorescent iron lines as a probe of astrophysical BH systems, and Martocchia et al. (2000) on details about the Fe line diagnostics in the "cold'' disk assumption.

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