The compact object gets only a fraction of the wind and converts its energy of the accreted plasma into X-rays. The X-ray production by accretion from an undisturbed spherical wind can fall several orders of magnitude below the observed luminosity in the case of some binary systems. There have been some modifications to the first basic theory that brought the observations closer to a prediction. The Be star in the pair is the one that controls the X-ray emission of the system. A Be star is a B star the rotates so quickly that it results in an instability .
Materials stream out from the equatorial plane and an expanding atmosphere is formed.
The causes strong emission lines of hydrogen and neutral helium into the stellar spectrum. In addition these stars are known to throw off large amounts of matter from their equatorial regions at seemingly random intervals. The gathering and accretion of this material is thought to be the source of many observed X-ray transients. Magnetic fields on neutron stars in binary systems and neutron stars in general can be as high as 1,000 billion times that of the Earth. These are the strongest magnetic fields known anywhere in the universe.