|Title||GT Observations of Hot Stars: Tau Sco|
|Author||Dr Albert Brinkman|
|Description||GT-Tau Sco is an OB star which shows OVI superionization caused by X-ray ionization and the Auger Ionization effect. It has a large Lx-Lbol ratio (of about 10E-6) and an unusually hard X-ray spectrum. It has been suggested that clumps form in the stellar wind, stagnate and fall inward. Because of the high shock velocity that this model predicts, the temperatures in the wind can be unusually hard: high enough that the XMM spectra should show lines of ionization stages that can place strong constraints on the structure of the X-ray forming regions of the star.|
|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, 2002-09-22T00:00:00Z, 011254, 17.56_20190403_1200. https://doi.org/10.5270/esa-0urww68|