Optical Observations of GRO J1655โ40 in Quiescence. I. A Precise Mass for the Black Hole Primary
Optical Observations of GRO J1655โ40 in Quiescence. I. A Precise Mass for the Black Hole Primary
We report photometric and spectroscopic observations of the black hole binary GRO J1655-40 in complete quiescence. In contrast to the 1995 photometry, the light curves from 1996 are almost completely dominated by ellipsoidal modulations from the secondary star. Model fits to the light curves, which take into account the temperature โฆ