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3D Hydrodynamic & Radiative Transfer Models of X-ray Emission from Colliding Wind Binaries

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(May 19, 2014)

Abstract

Colliding wind binaries (CWBs) are unique laboratories for X-ray astrophysics. The massive stars in these systems possess powerful stellar winds with speeds up to \$\sim\$3000 km s\$^-1\$, and their collision leads to hot plasma (up to \$\sim10^8\$K) that emit thermal X-rays (up to \$\sim\$10 keV). Many X-ray telescopes have observed CWBs, including Suzaku, and our work aims to model these X-ray observations. We use 3D smoothed particle hydrodynamics (SPH) to model the wind-wind interaction, and then perform 3D radiative transfer to compute the emergent X-ray flux, which is folded through X-ray telescopes' response functions to compare directly with observations. In these proceedings, we present our models of Suzaku observations of the multi-year-period, highly eccentric systems \$\eta\$ Carinae and WR 140. The models reproduce the observations well away from periastron passage, but only \$\eta\$ Carinae's X-ray spectrum is reproduced at periastron; the WR 140 model produces too much flux during this more complicated phase.

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