|Title||The extreme colliding wind binary HD 93129A moving away from periastron|
|Author||Prof Hugues Sana|
|Description||With a total mass of over 100Msun, e>0.9 and P_orbvirgul120yr, HD93129A is one of the most extreme massive binaries known. Astrometric measurements of its orbit have revealed a periastron passage in Fall 2018. The strong stellar winds of the two stars and the tight separation at periastron are producing an intense wind-wind collision (WWC) and an unusually high thermal and non-thermal X-ray emission that we are currently monitoring. Here we request two additional 25ksec XMM observations to follow the X-ray emission decrease as the system progresses away from periastron. Obtaining a full coverage of the X-ray emission of HD93129A is a once-in-a-life-time opportunity to achieve observational breakthroughs in our understanding of the shock physics and of the WWC hydrodynamics.|
|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, 2021-01-03T23:00:00Z, 084503, 18.00_20191217_1110. https://doi.org/10.57780/esa-xjt26cd|