Pulse Period History and Phase Resolved Spectra of 1A 0535+262

Details Pulse Period History and Phase Resolved Spectra of 1A 0535+262 Pulse Period History and Phase Resolved Spectra of 1A 0535+262

2008-01-25

arxiv.org/abs/0801.3897v1

Proceedings of the 6th INTEGRAL Workshop "The Obscured Universe", Published by ESA, 2007, SP-622, P.471-474

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures, published in Proceedings of the 6th INTEGRAL Workshop "The Obscured Universe"

Scientific paper

The Be/X-ray binary 1A 0535+262 was discovered in 1975 during a giant outburst. Afterwards it has shown periods of quiescence (flux below 10 mCrab), normal outbursts (10 mCrab-1Crab) and occasionally giant outbursts (several Crab). Ending 11 years of quiescence, the last giant outburst took place in May/June 2005, but the source was too close to the Sun to be observed by most satellites. A subsequent normal outburst took place in August 2005, which was observed by INTEGRAL and RXTE TOO observations. Based on INTEGRAL data, we present results on the long term pulse period history of the source, on their energy dependent pulse profiles and on phase resolved spectra.

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