New outburst of A 0535+26 observed with INTEGRAL and RXTE
Klochkov, D.; Santangelo, A.; Wilms, J.; Ferrigno, C.; Pottschmidt, K.; Kretschmar, P.; Staubert, R.; Caballero, I.; Postnov, K.; Camero-Arranz, A.; Domingo, A.; Suchy, S.; Kreykenbohm, I.; Schönherr, G.; McBride, V.; Finger, M.; Rothschild, R.
France, Spain, United States, Germany, Switzerland, Russia, United Kingdom
Abstract
A new outburst of the Be/X-ray binary system A0535+26 took place in August 2009. It is the fourth in a series of normal outbursts that have occurred around the periastron passage of the source, but is unusual by starting at an earlier orbital phase and by presenting a peculiar double-peaked light curve. TOO observations have been performed with INTEGRAL, RXTE and Suzaku. First results of these observations are presented, with special emphasis on the cyclotron lines present in the X-ray spectrum of the source, as well as in the pulse period and energy dependent pulse profiles of the source.