A dataset provided by the European Space Agency

Name 014363
Title Activity cycles and Maunder minima stars


DOI 10.5270/esa-c9a9rrt
Author Prof Juergen Schmitt
Description We propose to continue monitoring three fields containing a total of five late-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 and HD 81809 having cyclic activity changes, and Alpha Cen A and B, the nearest solar-like star. All of these stars are known X-ray sources, which have already benn monitored in XMM-Newton AO1. The overall goal of this series of observations is to obtain a baseline of a decade for these objects in order to check whether other solar -like stars show cyclic changes in their X-ray output just like the Sun.
Publication High-amplitude, long-term X-ray variability in the solar-type star HD 81809: The beginning of an X-ray activity cycle? . Favata, F., Micela, G., et all. . A&A . 418-13 . 2004 . 2004A&A...418L..13F ,
X-rays from alpha Centauri - The darkening of the solar twin . Robrade, J., Schmitt, J. H. M. M., . A&A . 442-315 . 2005 . 2005A&A...442..315R ,
The coronal Ne-O abundance of alpha Centauri . Liefke, C., Schmitt, J. H. M. M., . A&A . 458-1 . 2006 . 2006A&A...458L...1L ,
The X-ray cycle in the solar-type star HD 81809. XMM-Newton observations and implications for the coronal structure . Favata, F., Micela, G., et all. . A&A . 490-1121 . 2008 . 2008A&A...490.1121F ,
The Cycles of alpha Centauri . Ayres, Thomas R., . ApJ . 696-1931 . 2009 . 2009ApJ...696.1931A ,
The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue . Watson, M. G., Schroder, A. C., et all. . A&A . 493-339 . 2009 . 2009A&A...493..339W ,
Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras . Mateos, S., Saxton, R. D., et all. . A&A . 496-879 . 2009 . 2009A&A...496..879M ,
The XMM Cluster Survey: optical analysis methodology and the first data release . Mehrtens, Nicola, Romer, A. Kathy, et all. . MNRAS . 423-1024 . 2012 . 2012MNRAS.423.1024M ,
Coronal activity...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2003-11-22T05:33:21Z/2005-08-17T20:34:06Z
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 2007-12-16T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2007-12-16T00:00:00Z, 014363, 17.56_20190403_1200. https://doi.org/10.5270/esa-c9a9rrt