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Colliding Wind Binaries

Colliding Wind Binaries. Binaries containing two powerful stellar winds are great laboratories for the study of particle acceleration and the relationship of radio and X-ray generation in shocks .

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Colliding Wind Binaries

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  1. Colliding Wind Binaries Binaries containing two powerful stellar winds are great laboratories for the study of particle acceleration and the relationship of radio and X-ray generation in shocks. X-rays are dominated by thermalization of the two winds: provides direct diagnostics of winds and mass loss rates (wind speed often known). General behavior depends on competition between radiative cooling and dynamical timescales. Radio requires acceleration to relativistic energies at the shock (1st order) or in turbulence (2nd order). Great examples of cooperation of radio + X-ray: radio can image shocks, see thermal winds; X-rays give you energetics. Because basic geometry is simple, simulations can be set up and forced to match data from both X-ray and radio data. Understanding difference in properties between single stars and binaries is a powerful tool for studying locations such as galactic center clusters. Can single hot O and WR stars produce nonthermal radio emission? X-rays show that the shocks in the winds of these stars are weak: does that matter for acceleration of electrons?

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