The closer the star the larger The Parallax angle.
The primary mechanism driving the X-ray emission in traditional supergiant high mass X-ray binaries and supergiant fast X-ray transients is the accretion of stellar wind material by a compact object.
We present the first simulation of the fast and dense massive star wind accretion onto a neutron star in this paper, taking into account the effects of the centrifugal and magnetic inhibition of accretion ("gating") caused by the spin and magnetic field of the compact object.
We modeled the nonstationary radiatively generated wind of an O-B supergiant star using a radiative hydrodynamical code, and then we positioned a neutron star with a fixed magnetic field and spin period at a specific distance from the massive companion.
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