Abstract
We report the first resolved rapid transition from a Flaring Branch Oscillation to a Normal Branch Oscillation in the RXTE data of the Z source Sco X-1. The transition took place on a time scale of ~100 s and was clearly associated to the Normal Branch-Flaring Branch vertex in the color–color diagram. We discuss the results in the context of possible association of the Normal Branch Oscillation with other oscillations known both in Neutron-Star and Black-Hole systems, concentrating on the similarities with the narrow 4–6 Hz oscillations observed at high flux in Black-Hole Candidates.
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