Other
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..324p&link_type=abstract
XMM-Newton Proposal ID #02062405
Other
Hd 193576, Hd 193576, Hd 193576, Hd 193576, Hd 193576, Xmm-Newton Proposal 02062405
Scientific paper
We propose to observe the archetypical short-period colliding winds binary V444 Cygni (HD 193576) with XMM-Newton. V444 Cyg consists of a Wolf-Rayet (WR) star with an OB companion (WN5+O6), in a 4.2 day orbit. It is one of the best studied early-type binary systems and is the brightest eclipsing WR + O-star binary. Previous ROSAT and ASCA observations show continuous and complicated X-ray variability with eclipses when each star passes in front of the other. The requested phase constrained observations will provide stringent testing of colliding wind models, will determine the importance of anticipated physical mechanisms such as radiative braking, and will more generally examine the formation of X-rays in hot star winds.
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