| Proposal ID | 060082 |
| Title | Coronal activity cycles in solar analog stars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0600820401 |
| DOI | https://doi.org/10.5270/esa-xum1bx0 |
| Principal Investigator, PI | Dr Fabio Favata |
| Abstract | The present program to detect and study for the first time solar-like cycles inthe X-ray emission of stars similar to our Sun has been ongoing since XMM sAO-1. Five targets in three stellar systems have been monitored from 2001,providing for the first time clear evidence of long-term cycles in the X-rayluminosity of normal stars, with variations in X-ray luminosity of up to anorder of magnitude. The present proposal requests continuation of the ongoingmonitoring program into XMM AO-8, needed to progress toward fullcharacterization of the coronal cycle for our targets. The most observed of ourtargets (HD 81809) will enter its cycle maximum during the XMM AO-8 period, andgiven the higher variability expected at maximum, we request a more frequent sampling for this target. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2009-05-24T23:00:31Z/2010-05-01T03:03:47Z |
| 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 | 2011-05-21T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "targets hd 81809", "cycle maximum", "xray luminosity", "time solar", "solar analog stars", "stellar systems", "normal stars", "coronal activity cycles", "xray emission", "XMM", "term cycles", "frequent sampling", "coronal cycle", "xmm ao" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Fabio Favata, 2011, 'Coronal activity cycles in solar analog stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-xum1bx0 |