1, located in
the Chamaeleon I star-forming cloud, show that it is a
~106-year-old brown dwarf with spectral type M7.5 to M8
and 0.04 ± 0.01 solar masses. Quiescent x-ray emission was
detected in a 36-kilosecond observation with 31.4 ± 7.7 x-ray
photons, obtained with the Röntgen Satellite (ROSAT),
with 9
detection significance. This corresponds to an x-ray
luminosity of 2.57 × 1028 ergs per second and an
x-ray to bolometric luminosity ratio of 10
3.44. These are
typical values for late M-type stars. Because the interior of brown
dwarfs may be similar to that of convective late-type stars, which are
well-known x-ray sources, x-ray emission from brown dwarfs may indicate
magnetic activity.
Science. ISSN 0036-8075 (print), 1095-9203 (online)
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