Violent stellar merger model for transient events

Violent Stellar Merger Model for Transient Events

We derive the constraints on the mass ratio for a binary system to merge in a violent process. We find that the secondary to primary stellar mass ratio should be 0.003 . (M2/M1) . 0.15. A more massive secondary star will keep the primary stellar envelope in synchronized rotation with the orbital motion until merger occurs. This implies a very small relative velocity between the secondary star a...

Magnetic Activity in Stellar Merger Products

We study the expected X-ray luminosity of stellar merger products several years after merger. The X-ray emission is assumed to result from magnetic activity. The extended envelope of the merger product possesses a large convective region and it is expected to rotate fast. The rotation and convection might give rise to an efficient dynamo operation, therefore we expect strong magnetic activity. ...

Angry Crowds: Detecting Violent Events in Videos

Violent sabotage of mass-gathering events.

Research and evaluation of health and medical response during mass-gathering events originated during the early phases of disaster medical science. While there is no standard definition of a mass gathering, a simple way of conceptualizing a mass gathering is as an event with a theme occurs at a location and more people than usual for the location come together. Because mass gatherings occur as ...

Statistical Mechanics of Violent Relaxation in Stellar Systems

We discuss the statistical mechanics of violent relaxation in stellar systems following the pioneering work of Lynden-Bell (1967). The solutions of the gravitational Vlasov-Poisson system develop finer and finer filaments so that a statistical description is appropriate to smooth out the small-scales and describe the “coarse-grained” dynamics. In a coarse-grained sense, the system is expected t...