Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..285p&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
During the last few years X-ray emission has been detected from several brown dwarfs with the ROSAT Chandra and XXM-Newton X-ray observatories. Most of theX-ray detected brown dwarfs are young objects with ages of less than 10 Myr. Their typical fractional X-ray luminosities are log(Lx/Lbol) ~ -4...-3 i.e. very similar to the values observed for very-low mass stars. Their X-ray lightcurves show low-level variability but in most cases no large flares; this implies that the young brown dwarfs are able to produce quiescent X-ray emission. An analysis of the Chandra X-ray spectra of several brown dwarfs suggests plasma temperatures between 5 MK and 20 MK and indicates a decline in plasma temperature with decreasing effective temperture (or increasing age). The observed X-ray properties of the brown dwarfs are dicussed in the context of the still open question how brown dwarfs can sustain an X-ray emitting hot corona as they are fully convective and therefore a standard solar-like dynamo cannot work.
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