Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26

Details Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26 Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26

2003-05-12

arxiv.org/abs/astro-ph/0305194v1

Mon.Not.Roy.Astron.Soc. 350 (2004) 1457

Astronomy and Astrophysics

Astrophysics

10 pages, 11 figs, submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07743.x

A0535+26 is shown to display quantised IR excess flux states, which are interpreted as the first observational verification of the resonant truncation scheme proposed by Okazaki and Negueruela (2001) for BeXRBs. The simultaneity of X-ray activity with transitions between these states strongly suggests a broad mechanism for outbursts, in which material lost from the disc during the reduction of truncation radius is accreted by the NS. Furthermore changes between states are shown to be governed by a 1500 day period, probably due to precession of the Be disc, which profoundly dictates the global behaviour of the system. Such a framework appears to be applicable to BeXRBs in general.

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