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Observations of the High-mass X-Ray Binary A 0535+26 in Quiescence

Fürst, Felix; Pottschmidt, Katja; Wilms, Jörn +7 more

We have analyzed three observations of the high-mass X-ray binary A 0535+26 performed by the Rossi X-Ray Timing Explorer (RXTE) three, five, and six months after the last outburst in 2011 February. We detect pulsations only in the second observation. The 3-20 keV spectra can be fit equally well with either an absorbed power law or absorbed thermal…