2012 JO4

Available from the Minor Planet Center.

Long-term studies of Z sources with hexte/rxte

Using the High Energy X-Ray Timing Experiment (HEXTE) on-board the Rossi XRay Timing Explorer (RXTE) we perform a spectral study of the Z sources, with emphasis on the production of hard X-ray tails (HXT). Data from the Proportional Counter Array (PCA) were used to determine the position of the source in the Z diagram. We present current results of this ongoing study. Previous results show that, at least for Sco X-1, there is no correlation between the presence of a HXT and the position on the Z. For GX 5-1, in 1 out of 12 observations, the presence of a HXT is compelling, although...

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