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25 April 2024

» arxiv » 1410.6117

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V444 Cyg X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region
Jamie R. Lomax ; Yael Naze ; Jennifer L. Hoffman ; Christopher M.P. Russell ; Michael De Becker ; Michael F. Corcoran ; James W. Davidson ; Hilding R. Neilson ; Stan Owocki ; Julian M. Pittard ; Andy M.T. Pollock ;
Date:	22 Oct 2014
Abstract:	We present results from a study of the eclipsing, colliding-wind binary V444 Cyg that uses a combination of X-ray and optical spectropolarimetric methods to describe the 3-D nature of the shock and wind structure within the system. We have created the most complete X-ray light curve of V444 Cyg to date using 40 ksec of new data from Swift, and 200 ksec of new and archived XMM-Newton observations. In addition, we have characterized the intrinsic, polarimetric phase-dependent behavior of the strongest optical emission lines using data obtained with the University of Wisconsin’s Half-Wave Spectropolarimeter. We have detected evidence of the Coriolis distortion of the wind-wind collision in the X-ray regime, which manifests itself through asymmetric behavior around the eclipses in the system’s X-ray light curves. The large opening angle of the X-ray emitting region, as well as its location (i.e. the WN wind does not collide with the O star, but rather its wind) are evidence of radiative braking/inhibition occurring within the system. Additionally, the polarimetric results show evidence of the cavity the wind-wind collision region carves out of the Wolf-Rayet star’s wind.
Source:	arXiv, 1410.6117
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