|Title||Investigating the origin of the X-ray emission of Cyg OB2 #5 - continuation|
|Author||Mr Constantin Cazorla|
|Description||Massive stars have strong winds, which collide in massive binaries, giving rise to hard and varying X-ray emission. Cyg OB2 #5 is such a case. It was recently found to be a quadruple system and changes in its X-ray emission indicate that some X-rays arise in the wind-wind collision (WWC) between the close binary and the third star orbiting it in 6.7 yrs. In this context, X-rays are a crucial tool to constrain the orbital parameters, but the 6.7 yr orbit is poorly sampled. A monitoring (one observation per year) is thus needed. To continue this program, we request in this AO a short exposure (10 ks).|
|Publication||Quest for the tertiary component in Cyg OB2 #5 . Rauw, Gregor, Naze, Yael, . A&A . 627-2 . 2019 . 2019A&A...627A...2R ,
Variations on a theme: the puzzling behaviour of Schulte 12 . Naze, Yael, Rauw, Gregor, et all. . A&A . 627-99 . 2019 . 2019A&A...627A..99N ,
Search for non-thermal X-ray emission in the colliding wind binary Cygnus OB2 #8A . Mossoux, E., Pittard, J. M., et all. . A&A . 636-109 . 2020 . 2020A&A...636A.109M ,
|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, 2018-05-06T22:00:00Z, 080015, 17.56_20190403_1200. https://doi.org/10.5270/esa-pb7s9i8|