We propose to embark upon a systematic investigation of X-ray activity on fieldstars and brown dwarfs at the spectral type M/L transition and beyond usingsensitive XMM-Newton observations. The aim of this study is to examine thenature and efficiency of stellar dynamos at the bottom of the main-sequence. Forthis purpose we carefully selected a sample of ultra-cool dwarfs (spectral typeM7 and later) which are nearby (within 15 pc) and known to sustain achromosphere (Halpha emission has been detected). These characteristics make ourtargets most promising in a search for X-ray emission.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2006-02-19T05:25:56Z/2006-02-19T16:41:43Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Dr Beate Stelzer, 2007, 'X-ray activity at the low-mass end of the main-sequence', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-6e739a2
