Volume 573, January 2015
|Number of page(s)||18|
|Published online||15 December 2014|
V444 Cygni X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region
Département AGO, Université de Liège, Allée du 6 Août 17, Bât. B5C, 4000
e-mail: Jamie.R.Lomax@ou.edu, email@example.com
2 Department of Physics & Astronomy, University of Denver, 2112 E. Wesley Ave., Denver, CO 80210, USA
3 Homer L. Dodge Department of Physics & Astronomy, University of Oklahoma, 440 W Brooks Street, Norman, OK 73019, USA
4 Faculty of Engineering, Hokkai-Gakuen University, Toyohira-ku, 062-8605 Sapporo, Japan
5 CRESST/NASA Goddard Space Flight Center, Code 662, Greenbelt, MD, 20771; University Space Research Association, Columbia, MD, USA
6 Department of Physics & Astronomy, University of Toledo, 2801 W Bancroft St, Toledo, OH 43606, USA
7 Department of Physics & Astronomy, East Tennessee State University, Box 70652, Johnson City, TN 37614, USA
8 Department of Physics & Astronomy, University of Delaware, Newark, DE 19716, USA
9 School of Physics & Astronomy, The University of Leeds, Leeds, LS2 9JT, UK
10 European Space Agency, XMM-Newton SOC, ESAC, Apartado 78, 28691 Villanueva de la Cañada, Madrid, Spain
Received: 24 June 2014
Accepted: 16 October 2014
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 3D 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 ks of new data from Swift, and 200 ks 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.
Key words: binaries: eclipsing / stars: Wolf-Rayet / stars: winds, outflows / stars: individual: V444 Cyg / techniques: polarimetric / X-rays: stars
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.