Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.354..913b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 3, pp. 913-914.
Astronomy and Astrophysics
Astronomy
2
Stars: Individual: Ɛ Indi Bab, Stars: Low-Mass, Brown Dwarfs, Radio Continuum: Stars
Scientific paper
We have observed the nearest known brown dwarfs, the binary system ɛ Indi Bab (d= 3.626 pc), for 8.6- and 4.8-GHz radio emission with the Australia Telescope Compact Array. If either brown dwarf emits radio flares, then they are respectively at least 5.5 and 1.2 times weaker than LP 944-20, the nearest brown dwarf with detected radio emission. We associate the ROSAT source 1WGA J2203.9 - 5647 with ɛ Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then ɛ Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 × 1025 erg s-1 which makes it roughly a factor of 2 less luminous than LP 944-20. The radio non-detections imply that ɛ Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the Güdel-Benz relationship of X-ray and radio emission.
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