2015A&A...573A..43L


Query : 2015A&A...573A..43L

2015A&A...573A..43L - Astronomy and Astrophysics, volume 573A, 43-43 (2015/1-1)

V444 Cygni X-ray and polarimetric variability: Radiative and Coriolis forces shape the wind collision region.

LOMAX J.R., NAZE Y., HOFFMAN J.L., RUSSELL C.M.P., DE BECKER M., CORCORAN M.F., DAVIDSON J.W., NEILSON H.R., OWOCKI S., PITTARD J.M. and POLLOCK A.M.T.

Abstract (from CDS):

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 40ks 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.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: Wolf-Rayet - stars: winds, outflows - stars: individual: V444 Cyg - techniques: polarimetric - X-rays: stars

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 50896 WR* 06 54 13.0439608392 -23 55 42.023319852 5.74 6.63 6.91 7.74   WN4b 762 0
2 HD 193576 WR* 20 19 32.4229160448 +38 43 53.959035756 8.15 8.53 8.00     WN5+O6II-V 696 0

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2023.02.01-07:14:21

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