We propose to observe the interacting wind binary system HDE228766 at threecarefully chosen orbital phases. This system hosts a rare Of-WN8ha transitionobject whose wind crashes onto the surface of its O7 companion. The X-raybrightness and the geometry of the system offer ideal conditions to probe thewind of the transition star: by comparing X-ray spectra taken at three phases,we will constrain its mass-loss rate, investigate the feedback of the X-rayemission on the ionization structure of the wind and study the impact of thewind interaction zone on the optical spectrum of the O7 companion.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2011-05-05T01:30:38Z/2011-05-18T19:25:03Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Prof Gregor Rauw, 2012, 'X-raying the colliding wind binary system HDE228766', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bun7g4k
