|Title||Coronal activity cycles in solar analog stars|
|Author||Dr Fabio Favata|
|Description||The present monitoring program to identify and study for the first time the cyclic behavior of the coronal emission of stars similar to our Sun has been ongoing since XMM.s AO-1. Five stars in three stellar systems have been monitored for over a decade, providing for the first time clear evidence of long-term cycles in the coronal activity of normal stars. The present proposal requests continuation of the ongoing monitoring program into AO-15, needed to progress in the understanding of the coronal behavior across different activity cycles. Our best observed targets, HD81809 and 61CygA, have both been observed through almost two, well-defined cycles, while a cycle is becoming evident in the observations of alpha Cen B.|
|Publication||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 ,
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, 2018-05-30T22:00:00Z, 078334, 17.56_20190403_1200. https://doi.org/10.5270/esa-cy30iyg|