With the advent of large-scale optical photometric monitoring and exoplanetsearch programs, the number of stars with known stellar cycles has rapidlygrown. In parallel, advances in theoretical modeling are leading to a revolutionin our understanding of stellar structure and magnetic field generation inlate-type stars. Still, many questions remain, and new puzzles have arisen, suchas the existence of cycles in fully convective stars. X-ray emission is a keydiagnostic of stellar magnetic activity, and X-ray cycle amplitudes are muchlarger 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 ofthree stars that will significantly broaden the X-ray perspective on stellar cycles.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-11-18T06:14:40Z/2019-12-09T11:13:12Z
Version
18.00_20191217_1110
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Dr Bradford Wargelin, 2021, 'The X-Ray View of Stellar Cycles', 18.00_20191217_1110, European Space Agency, https://doi.org/10.57780/esa-9m4kzsx
