|Title||Maunder minimum stars: How frequent are they ?|
|Author||Prof Jurgen Schmitt|
|Description||The exceptional low activity of the Sun during the Maunder minimum period between 1650 - 1715 is still an unsolved astrophysical puzzle; the appearance of solar activity during that period is of major interest both for solar physicists and climatologists. Searches for stellar analogs of the Maunder minimum Sun have had only mixed success and it is controversial how common Maunder minimum stars really are. We propose to carry out a sensitive X-ray survey of extremely low activity stars in the immediate solar neighborhood to investigate whether these stars are ..flat-activity.. objects or show cyclic behavior similar to the Sun.|
|Publication||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 ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
An improved age-activity relationship for cool stars older than a gigayear . Booth, R. S., Poppenhaeger, K., et all. . MNRAS . 471-1012 . 2017 . 2017MNRAS.471.1012B ,
The Relative Emission from Chromospheres and Coronae: Dependence on Spectral Type and Age . Linsky, Jeffrey L., Wood, Brian E., et all. . ApJ . 902-3 . 2020 . 2020ApJ...902....3L ,
|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, 2013-02-25T00:00:00Z, 067038, PPS_NOT_AVAILABLE. https://doi.org/10.5270/esa-eqdwv2r|