| Proposal ID | 014363 |
| Title | Activity cycles and Maunder minima stars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0143630101 |
| DOI | https://doi.org/10.5270/esa-c9a9rrt |
| Principal Investigator, PI | Prof Juergen Schmitt |
| Abstract | We propose to continue monitoring three fields containing a total of fivelate-type stars for long-term variability. The stars are 61 Cyg A and B, HD 81809, all of which are being monitored for Ca emission, with 61 Cyg A andHD 81809 having cyclic activity changes, and Alpha Cen A and B, the nearestsolar-like star. All of these stars are known X-ray sources, which have alreadybenn monitored in XMM-Newton AO1. The overall goal of this series ofobservations is to obtain a baseline of a decade for these objects in order tocheck whether other solar -like stars show cyclic changes in their X-ray outputjust like the Sun. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2003-11-22T05:33:21Z/2005-08-17T20:34:06Z |
| Version | 21.51_20241115_1113 |
| 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 | 2007-12-16T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "hd 81809", "xray sources", "XMM-Newton", "maunder minima stars", "activity cycles", "xmm newton ao1", "alpha cen", "xray output", "term variability", "ca emission", "XMM", "benn monitored", "late type stars", "cyclic activity" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Juergen Schmitt, 2007, 'Activity cycles and Maunder minima stars', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-c9a9rrt |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |