The mass of X-ray Nova Scorpii 1994 (=GRO J1655-40)
The mass of X-ray Nova Scorpii 1994 (=GRO J1655-40)
We have obtained high- and intermediate-resolution optical spectra of the black hole candidate Nova Scorpii 1994 in 1998 May/June, when the source was in complete (X-ray) quiescence. We measure the radial velocity curve of the secondary star and obtain a semi-amplitude of K2=215.5 ± 2.4 km s-1, which is 6 …