|Title||The X-Ray View of Stellar Cycles|
|Author||Dr Bradford Wargelin|
|Description||With the advent of large-scale optical photometric monitoring and exoplanet search programs, the number of stars with known stellar cycles has rapidly grown. In parallel, advances in theoretical modeling are leading to a revolution in our understanding of stellar structure and magnetic field generation in late-type stars. Still, many questions remain, and new puzzles have arisen, such as the existence of cycles in fully convective stars. X-ray emission is a key diagnostic of stellar magnetic activity, and X-ray cycle amplitudes are much larger than in the optical, but of the hundreds of stars with confirmed cycles, only seven have been monitored in X rays. We request XMM-Newton observations of three stars that will significantly broaden the X-ray perspective on stellar cycles.|
|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, 2021-01-04T00:00:00Z, 084268, 18.00_20191217_1110. https://doi.org/10.57780/esa-9m4kzsx|