Using a population number synthesis code, we estimate the relative rates of different type (II and Ib,c) of supernovae for regions of constant star formation. We combine a large set of massive single star and massive close binary evolutionary computations and allow for black hole formation. If a neutron star forms, the binary system is followed through a supernova explosion where we account for...

I calculate the specific angular momentum of mass accreted by a binary system embedded in the dense wind of a mass losing asymptotic giant branch star. The accretion flow is of the Bondi-Hoyle-Lyttleton type. For most of the relevant parameters space the flow is basically an isothermal high Mach number accretion flow. I find that when the orbital plane of the accreting binary system and the orb...

We investigate the possibility that mass transfer early in the evolution of a massive binary can effect a reversal of the end states of the two components, resulting in a neutron star which forms before a black hole. In this sense, such systems would comprise the high-mass analogues of white dwarf-neutron star systems such as PSR B2303+46. One consequence of this reversal is that a second episo...

The Dripping Handrail Model (DHR) is a discrete dynamical system used to model a binary star system in which matter accretes off of one star onto the other. With this model, we study the behavior of the matter as it collects in a ring around the star, called an accretion disc, builds up, and eventually drips onto the surface of the star. Considering the accretion disc as both a one dimensional ...

We demonstrate that single and binary star clusters can be formed during cloud-cloud collisions triggered by the tidal interaction between the Large and Small Magellanic clouds. We run two different sets of self-consistent numerical simulations which show that compact, bound star clusters can be formed within the centers of two colliding clouds due to strong gaseous shocks, compression, and dis...

In the light of recent observations in which short γ-ray bursts are interpreted as arising from black-hole, neutron-star or neutron-star, neutron-star mergings we would like to review our research on the evolution of compact binaries, especially those containing neutron stars. These were carried out with predictions for LIGO in mind, but are directly applicable to short γ-ray bursts in the inte...