Observations of A 0535+26 With RXTE and Swift

Astronomy and Astrophysics – Astronomy

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Scientific paper

We report on observations with RXTE and Swift/BAT of the accreting Be/X-ray binary pulsar A0535+26. RXTE pointed observations were made on the tail of the May-June 2005 giant (type II) outburst, and during normal (type I) outbursts which followed in August-September 2005 and in December 2005-January 2006. Several serendipitous BAT observations occurred during the giant outburst, which was poorly observed due to the closeness of the sun, and frequent BAT observation occurred during the following normal outbursts. We present an updated outburst ephemeris, estimates of the spin-up during the giant outburst and evidence for spin-up during the normal outbursts, the normal outburst light curves, evolution of the pulse profiles during the normal outbursts, and changes seen in the power-spectra.

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