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The advent of the large effective apertures of the Keck telescopes hasresulted in the determination with unprecedented accuracy of the mass functionsand mass ratios of faint (R ~ 21 mag) X-ray transients (GS 2000+25, GROJ0422+32, Nova Oph 1977, Nova Vel 1993), as well as constraining themain-sequence companion star parameters and producing images of the accretiondisks around the black holes.Comment: 7 pages, 4 figures, SPIE Symposium 4005, in pres

Probing black hole x-ray binaries with the Keck telescopes