|Title||The hottest cool star:Probing the X-ray emission of the low activity star Altair|
|Author||Dr Jan Robrade|
|Description||We propose to observe the low activity star Altair (HD 187642) with XMM-Newton. With a spectral type of A7 it is the earliest, magnetically active, single late- type star detected by ROSAT and Einstein. At a distance of only 5 pc it is a unique target to study the X-ray properties of late A stars in detail. Altair is known to be a very fast rotator, however its X-ray luminosity of 2-3x10^27 erg-s is rather low and its L_X-L_bol ratio is the lowest measured in any nearby star. We want to obtain an RGS spectrum that allows to measure the Ne-O abundance in a low activity star, addressing the controversially debated solar and stellar neon abundance.The observation will enable us to investigate the properties of coronal plasma in a star with very shallow convection zone for the first time.|
|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, 2008-11-28T00:00:00Z, 050236, 17.56_20190403_1200. https://doi.org/10.5270/esa-khzl1ll|