|Title||THE CANONICAL SHORT PERIOD COLLIDING WIND BINARY V444 CYGNI|
|Author||Dr JULIAN PITTARD|
|Description||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.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2005-12-03T00:00:00Z, 020624, 17.56_20190403_1200. https://doi.org/10.5270/esa-j32y5eo|