Based on a dedicated XMM-Newton monitoring campaign started in 2015 we haverecently revealed an X-ray activity cycle on the young solar-like star eps Eri.From 2014 - 2017 the X-ray and the Ca II emission of eps Eri changed in a syn-chronized way with the 3-yr period of the Ca S-index that dominated the chromo-spheric variability of the star for the last two decades. Then, in 2018, adrastic change set in\: Both S-index and X-ray emission appear to change now onabout half the previous timescale, the S-index is significantly lower thanbefore, and whether X-ray and Ca II variability are still in phase is unclear.We propose to examine the long-term evolution of epsEri.s X-ray cycle during animportant change in its activity state with continued monitoring for 4 x 5 ks in AO19.
Instrument
EMOS1, EMOS2, EPN, RGS1, RGS2
Temporal Coverage
2020-07-22T17:57:15Z/2021-01-17T17:19:19Z
Version
18.02_20200221_1200
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, Prof Beate Stelzer, 2022, 'The changing activity cycle of the young solar-like star epsilon Eridani', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-oeg31cx
