A dataset provided by the European Space Agency

Name: The changing activity cycle of the young solar-like star epsilon Eridani
Published: 2022-02-04T00:00:00Z

Proposal ID	086019
Title	The changing activity cycle of the young solar-like star epsilon Eridani
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0860190201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0860190301
DOI	https://doi.org/10.57780/esa-oeg31cx
Principal Investigator, PI	Prof Beate Stelzer
Abstract	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 epsEris X-ray cycle during animportant change in its activity state with continued monitoring for 4 x 5 ks in AO19.
Publications	A multi-wavelength view of the multiple activity cycles of u03f5 Eridani \|Fuhrmeister B. Coffaro M. et al. \| A&A \| 672-149 \| 2023 \| 2023A&A...672A.149F \| http://ui.adsabs.harvard.edu/#abs/2023A&A...672A.149F The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P
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.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2022-02-04T00:00:00Z
Last Update	2025-01-27
Keywords	"term evolution", "ca ii variability", "XMM", "changing activity cycle", "2014 2017", "dedicated xmm newton", "xray activity cycle", "XMM-Newton", "star epsilon eridani", "syn chronized", "eps eri changed", "star eps eri", "yr period", "xray emission", "chromo spheric variability", "campaign started", "xray cycle", "ca ii emission"
Publisher And Registrant	European Space Agency
Credit Guidelines	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