The low-mass binary GJ 569B

Ben Lane
Caltech

I present photometric, astrometric and spectroscopic observations 
of the nearby (9.8 pc) low-mass binary Gl 569Bab made with the Keck 
adaptive optics facility.  The total mass of the pair is found to
be 0.123 +/- 0.027 solar masses, likely making this a pair of brown dwarfs