X-ray Emission from Brown Dwarfs

Details X-ray Emission from Brown Dwarfs X-ray Emission from Brown Dwarfs

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.

Affiliated with

Also associated with

No associations

Rating

X-ray Emission from Brown Dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-ray Emission from Brown Dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray Emission from Brown Dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1545283