|Title||Arcturus and the origin of the coronal graveyard|
|Author||Dr Christian Schneider|
|Description||Red giants like Arcturus occupy a region in the X-ray Hertzsprung-Russell Diagram (HRD) known as the coronal graveyard. The physical cause for the sharp decline of X-ray emission beyond a so-called dividing line that separates X-ray emitting yellow giants from X-ray dark red giants is, despite decades of research, not finally answered. The recent X-ray detection of Arcturus with Chandra HRC-I motivates our request to obtain spectral information with XMM-Newton EPIC spectroscopy. An 80 ks exposure is sufficient to detect large absorbing column densities that may be expected if severe obscuration by layers above the giant.s corona cause the decrease in their observed X-ray luminosity.|
|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, 2022-02-06T00:00:00Z, 086507, 18.02_20200221_1200. https://doi.org/10.5270/esa-[xxxxxxx]|