|Title||AK Sco: enhanced magnetic activity in a pre-main sequence interacting binary|
|Author||Prof Ana I. Gomez de Castro|
|Description||AK Sco is a unique source: a ~10 Myr old pre-main-sequence (PMS) spectroscopic binary composed of two nearly equal F5 stars that at periastron are separated by barely 11 stellar radii. The orbit is not yet circularized (e = 0.47) and very strong tides are expected. Previous high resolution UV spectroscopic observations carried out with the HST-STIS have shown that there is an extended region with plasma at logTe (K)=4.8 reaching 1.7R*. The magnetic diffusivity in this region is very small; unusually strong tidally modulated polarimetric variations of the system have been detected suggesting a strong coupling between gravitational tides and the stellar field. We propose to study the variation of the X-ray-UV spectrum of AK Sco as the stellar magnetospheres are modified by the tide.|
|Publication||XMM-Newton Monitoring of the Close Pre-main-sequence Binary AK Sco. Evidence of Tide-driven Filling of the Inner Gap in the Circumbinary Disk . Gomez de Castro, Ana I., Lopez-Santiago, Javier, et all. . ApJ . 766-62 . 2013 . 2013ApJ...766...62G ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Evidence of accretion triggered oscillations in the pre-main-sequence interacting binary AK Sco . Gomez, de Castro, Ana I., Lopez-Santiago, Javier, . MNRAS . 429-1 . 2013 . 2013MNRAS.429L...1G ,
|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, 2012-04-12T00:00:00Z, 065187, 17.56_20190403_1200. https://doi.org/10.5270/esa-40d6y90|