|Title||The nature of magnetic activity at the low-mass end of the main-sequence|
|Author||Dr Beate Stelzer|
|Description||We propose a systematic investigation of magnetic activity on ultracool dwarfs at the spectral type M-L transition. XMM-Newton allows to trace the effects of both non-thermal and thermal processes in cool star atmospheres simultaneously, using EPIC to detect coronal X-rays and the Optical Monitor to record optical emission in response to non-thermal electrons. We selected a sample of nearby ultracool dwarfs known to maintain magnetic fields and mostly yielding evidence for chromospheres. We aim at constraining the nature and efficiency of stellar dynamos and coronal heating at the bottom of the main-sequence by searching for the quiescent corona, establishing flare energy distributions, and studying the connection between chromospheric and coronal activity indicators.|
|Publication||The ultracool dwarf DENIS-P J104814.7-395606. Chromospheres and coronae at the low-mass end of the main-sequence . Stelzer, B., Alcala, J., et all. . A&A . 537-94 . 2012 . 2012A&A...537A..94S ,
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 ,
|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, 2011-02-12T00:00:00Z, 060041, 17.56_20190403_1200. https://doi.org/10.5270/esa-98mk8hz|