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The pre-outburst flare of the A0535+26 August/September 2005 outburst

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The pre-outburst flare of the A0535+26 August/September 2005 outburst

dc.contributor.author	Caballero, I.
dc.contributor.author	Santangelo, A.
dc.contributor.author	Kretschmar, P.
dc.contributor.author	Staubert, R.
dc.contributor.author	Postnov, K.
dc.contributor.author	Klochkov, D.
dc.contributor.author	Camero Arranz, Ascensión
dc.contributor.author	Finger, M. H.
dc.contributor.author	Kreykenbohm, I.
dc.contributor.author	Pottschmidt, K.
dc.contributor.author	Rothschild, R. E.
dc.contributor.author	Suchy, S.
dc.contributor.author	Wilms, J.
dc.contributor.author	Wilson, C. A.
dc.date.accessioned	2010-07-13T08:15:50Z
dc.date.available	2010-07-13T08:15:50Z
dc.date.issued	2008
dc.identifier.citation	Caballero, I., Santangelo, A., Kretschmar, P., Staubert, R., Postnov, K., Klochkov, D., Camero Arranz, A., Finger, M. H., Kreykenbohm, I., Pottschmidt, K., Rothschild, R. E., Suchy, S., Wilms, J. and Wilson, C. A. (2008): The pre-outburst flare of the A0535+26 August/September 2005 outburst, Astronomy and Astrophysics, núm. 480, vol. 2, pp. L17-L20	en
dc.identifier.uri	http://hdl.handle.net/10550/16003
dc.description.abstract	Aims. We study the spectral and temporal behavior of the High Mass X-ray Binary A 0535+26 during a “pre-outburst flare” which took place ∼5 d before the peak of a normal (type I) outburst in August/September 2005. We compare the studied behavior with that observed during the outburst. Methods. We analyse RXTE observations that monitored A 0535+26 during the outburst. We complete spectral and timing analyses of the data. We study the evolution of the pulse period, present energy-dependent pulse profiles both at the initial pre-outburst flare and close to outburst maximum, and measure how the cyclotron resonance-scattering feature (hereafter CRSF) evolves. Results. We present three main results: a constant period P = 103.3960(5) s is measured until periastron passage, followed by a spin-up with a decreasing period derivative of P ̇ = (−1.69 ± 0.04) × 10−8 s s−1 at MJD 53 618, and P remains constant again at the end of the main outburst. The spin-up provides evidence for the existence of an accretion disk during the normal outburst. We measure a CRSF energy of Ecyc ∼ 50 keV during the pre-outburst flare, and Ecyc ∼ 46 keV during the main outburst. The pulse shape, which varies significantly during both pre-outburst flare and main outburst, evolves strongly with photon energy.	en
dc.language.iso	en	en
dc.subject	X-rays : binaries; Stars : magnetic fields; Stars : individual : A 0535+26	en
dc.title	The pre-outburst flare of the A0535+26 August/September 2005 outburst	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Estrellas	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia::Fuentes de Rayos X	en
dc.identifier.doi	10.1051/0004-6361:20079310	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361:20079310&Itemid=129	en