| Proposal ID | 003234 |
| Title | Activity cycles in solar-type stars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0032340301 |
| DOI | https://doi.org/10.5270/esa-t1m7okl |
| Principal Investigator, PI | Dr Fabio Favata |
| Abstract | We propose to pursue a long-term monitoring program of a selection ofsolar-type stars all of which show clear cyclic behavior -- analogousto the solar cycle -- in their CaII flux, with the aim of detectingand studying, for the first time in X-rays, the presence of activitycycles in stars other than the Sun. Thus far only very active stars --which do not show CaII cycles but only irregular variability -- havebeen monitored with a sufficient time base in X-rays, with no evidencefor cycles. XMM makes it possible, for the first time, to efficientlymonitor the low-activity, cyclic stars which are the true analogues of |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2001-04-25T21:12:04Z/2003-05-03T13:31:07Z |
| Version | 17.56_20190403_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 | 2004-05-28T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "irregular variability", "active stars", "activity cycles", "cyclic stars", "solar cycle", "caii flux", "time base", "solar type stars", "caii cycles", "XMM", "xmm makes", "low activity" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Fabio Favata, 2004, 'Activity cycles in solar-type stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-t1m7okl |