|Title||What causes the dispersion of the O-star X-ray luminosities ?|
|Author||Dr Hugues Sana|
|Description||O-type X-ray luminosity scales with their bolometric luminosity according to canonical relation: log L_X-L_bol ~ -7. Yet, significant dispersion is observed around this relation. Binarity was often considered as a natural explanation to the observed dispersion but recent investigations tend to disprove this statement. We propose to investigate the impact of magnetic wind confinement on the X-ray properties of O stars, and whether or not it can explain the spread around the canonical relation. The nearby young open cluster, IC2944, hosts a rich late-type O-star population and is ideally suited for our purpose. It will allow us to investigate with unprecedented details a region of the parameter space where magnetic confinement is expected to have the strongest impact.|
|Publication||X-ray properties of the young open clusters HM1 and IC 2944-2948 . Naze, Y., Rauw, G., et all. . A&A . 555-83 . 2013 . 2013A&A...555A..83N ,
Is the Pollock.s paradigm of X-ray emission for O stars correct? . Ryspaeva, E. B., Kholtygin, A. F., . AN . 338-959 . 2017 . 2017AN....338..959R ,
Analysis of the X-ray emission of OB stars: O stars . Ryspaeva, Elizaveta, Kholtygin, Alexander, . RAA . 18-104 . 2018 . 2018RAA....18..104R ,
|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, 2013-01-27T00:00:00Z, 067206, 17.56_20190403_1200. https://doi.org/10.5270/esa-loy8ag4|