A dataset provided by the European Space Agency

Name 004174
Title Coronal Cycles of 61 Cyg and HR 3625


DOI 10.5270/esa-w4ej149
Author Dr Alexander Hempelmann
Description Although the coronal X-ray emission is the most powerful indicator of a stellar magnetic field the observation of coronal cycles has remained as an open task. Hempelmann et al. (1995) find indications for the existence of coronal cycles in stars other than the Sun from statistical considerations. The scientific goal 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 which suggest X-ray activity cycles. We want to continue these time series with EPIC XMM to cover a full cycle period.
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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 Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2005-09-09T00:00:00Z, 004174, 17.56_20190403_1200. https://doi.org/10.5270/esa-w4ej149