SIMBAD references

We investigate the hydrodynamics of three-dimensional classical Bondi-Hoyle accretion, especially the accretion of angular momentum from a non-homogeneous medium and discuss some consequences for models of wind-fed X-ray sources. A medium taken to be an ideal gas (γ=5/3) moves at Mach 3 past a totally absorbing sphere with a radius of 0.1 accretion radii. The velocity of this medium is given a gradient of 3% (per accretion radius distance) perpendicular to the bulk flow. The hydrodynamics is modeled by the "Piecewise Parabolic Method" and the resolution around the accretor is increased using 7 multiply nested grids. The flow in the shock cone is not steady, but does not exhibit large scale "flip-flop"-flow. The average specific angular momentum accreted is 0.097 (in units of accretion radii and sound speed). Although the magnitude is large compared to cases without velocity gradient, it still is not large enough to sustain the random walk model of wind-fed X-ray sources.