|Title||The massive binary HD 93129A: an extreme wind-wind collision during AO16|
|Author||Prof Hugues Sana|
|Description||With a total mass of over 100Msun, an eccentricity of 0.92 to 0.99 and a period of virgul120yr, HD93129A is one of the most extreme massive binaries known. New astrometric measurements now predict a periastron passage in 2017, much sooner than previously thought. The strong stellar winds of the two stars and the tight separation at periastron will produce an intense wind-wind collision (WWC) and an unusually high thermal and non-thermal X-ray emission. Here we request two quasi-simultaneous 25ksec XMM and NuStar observations to disentangle the thermal (stellar winds + WWC), dominating below 5keV, and non-thermal (>5keV) components from the WWC to an unprecedented accuracy. This event is a once-in-a-life-time opportunity to achieve observational breakthrough in WWC physics.|
|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, 2018-12-27T23:00:00Z, 080495, 17.56_20190403_1200. https://doi.org/10.5270/esa-uun47pd|