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Name:John Richard Jones


Institution:University of Southampton


Country:UK




Title:Accretion delay in HMXRB's




Abstract:Using  a Smoothed Particle Hydrodynamics code developed by Benz(1990) , Bate(1996) and modified for accretion/decretion discs Okazaki(2000), numerous simulations were run of a high mass X-ray binary system. 
In a set of runs where the period only was varied the data produced shows that the peak accretion rate occurs just after periastron and that the amount of delay depends on the period of the system. The longer the period the longer the delay. In a set of different runs where the eccentricity only was varied the delay after periastron was seen to vary according to the eccentricity, the higher e the longer the delay (e=0.0 circle). Furthermore the data produced shows that for high eccentricity (e=0.9) a double accretion peak is produced.
Column density plots of the decretion disc in various runs of the program have shown that there is a density inhomogeneity at the inner radius of the disc. This region covers approx one fifth of the inner radius of the disc and remains in this position throughout numerous orbits of the neutron star. The position of this density inhomogeneity is not perturbed by the neutron star and the resulting spiral density wave over a timescales of 20-60 orbits.
These points are presented and discussed in light of observations and knowledge of known systems.








            

            
            

              

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