|Title||Constraining the properties of the post-RLOF massive binary HD149404|
|Author||Prof Gregor Rauw|
|Description||HD149404 is an O7.5If + ON9.7I binary that has experienced a Case A Roche lobe overflow episode. Although the system has been studied intensively in the optical and UV, the orbital inclination as well as the wind parameters remain poorly constrained. The X-ray emission from the wind-wind interaction between the stars should be modulated by a changing wind column density as the stars revolve around each other. We propose three observations, of 25 ks each: two scheduled at conjunction phases, and one observation near quadrature. Using these three spectra, it is possible to establish the variations of the absorbing column density and hence to constrain the orbital inclination, the wind momentum ratio and the radial extent of the wind interaction zone.|
|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, 2019-09-17T22:00:00Z, 082051, 17.56_20190403_1200. https://doi.org/10.5270/esa-z6eq6b1|