|Title||tau Boo.s magnetic polarity switch in X-rays - continued monitoring|
|Author||Mrs Katja Poppenhaeger|
|Description||tau Boo is the first star other than the Sun which has been observed to have a global magnetic field with switching polarity. In contrast to the Sun, tau Boo.s magnetic cycle has a duration of only two years. In the previous AO, we were awarded four EPIC pointings of 8 ks each to monitor tau Boo.s activity in X-rays, backing up our observations with optical measurements of the chromospheric activity as well as Zeeman Doppler Imaging. We propose to continue monitoring the star during this AO with XMM-Newton for a total of 32 ks as well as with Chandra for a total of 10 ks to gain more insight into the stellar activity cycle by comparing X-ray luminosities and coronal temperatures derived from the CCD spectra to the chromospheric activity profile and the magnetic field configuration of tau Boo.|
|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, 2013-02-15T00:00:00Z, 067115, 17.56_20190403_1200. https://doi.org/10.5270/esa-3vn34kl|