| Proposal ID | 004174 |
| Title | Coronal Cycles of 61 Cyg and HR 3625 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0041740101 |
| DOI | https://doi.org/10.5270/esa-w4ej149 |
| Principal Investigator, PI | Dr Alexander Hempelmann |
| Abstract | Although the coronal X-ray emission is the most powerful indicator of a stellarmagnetic field the observation of coronal cycles has remained as an open task.Hempelmann et al. (1995) find indications for the existence of coronal cyclesin stars other than the Sun from statistical considerations. The scientificgoal of this proposal is to search for the existence of coronal cycles of stars. We started in 1994 with pointed HRI observations of 61 Cyg and HR 3625 to follow their activity cycles over the ROSAT A0-5, AO-6, AO-7 and AO-8 periods. The ROSAT light curves show systematic long-term variations whichsuggest X-ray activity cycles. We want to continue these time series with EPICXMM to cover a full cycle period. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2002-05-14T09:43:04Z/2004-05-01T19:20:02Z |
| 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 | 2005-09-09T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "stellar magnetic field", "xray activity cycles", "term variations", "EPIC", "cycle period", "activity cycles", "epic xmm", "hr 3625", "ROSAT", "rosat a0", "coronal xray emission", "XMM", "rosat light curves", "time series", "statistical considerations", "coronal cycles" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Alexander Hempelmann, 2005, 'Coronal Cycles of 61 Cyg and HR 3625', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-w4ej149 |