|Title||Coronal activity cycles in solar analog stars|
|Author||Dr Fabio Favata|
|Description||The present program to detect and study for the first time solar-like cycles in the X-ray emission of stars similar to our Sun has been ongoing since XMM s AO-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-ray luminosity of normal stars, with variations in X-ray luminosity of up to an order of magnitude. The present proposal requests continuation of the ongoing monitoring program into XMM AO-8, needed to progress toward full characterization of the coronal cycle for our targets. The most observed of our targets (HD 81809) will enter its cycle maximum during the XMM AO-8 period, and given the higher variability expected at maximum, we request a more frequent sampling for this target.|
|Publication||Coronal activity cycles in nearby G and K stars. XMM-Newton monitoring of 61 Cygni and alpha Centauri . Robrade, J., Schmitt, J. H. M. M., . A&A . 543-84 . 2012 . 2012A&A...543A..84R ,
Constraints on the Ubiquity of Coronal X-Ray Cycles . Hoffman, John, Gunther, Hans M., . ApJ . 759-145 . 2012 . 2012ApJ...759..145H ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091) . Boro Saikia, S., Jeffers, S. V., et all. . A&A . 594-29 . 2016 . 2016A&A...594A..29B ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Fifteen years in the high-energy life of the solar-type star HD 81809. XMM-Newton observations of a stellar activity cycle . Orlando, S., Favata, F., et all. . A&A . 605-19 . 2017 . 2017A&A...605A..19O ,
Deconvolving the HD 81809 Binary: Rotational and Activity Evidence for a Subgiant with a Sun-like Cycle . Egeland, Ricky, . ApJ . 866-80 . 2018 . 2018ApJ...866...80E ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2011-05-21T00:00:00Z, 060082, 17.56_20190403_1200. https://doi.org/10.5270/esa-xum1bx0|