SIMBAD references

2011A&A...525A.111I - Astronomy and Astrophysics, volume 525A, 111-111 (2011/1-1)

Achromatic late-time variability in thermonuclear X-ray bursts. An accretion disk disrupted by a nova-like shell?


Abstract (from CDS):

An unusual Eddington-limited thermonuclear X-ray burst was detected from the accreting neutron star in 2S 0918-549 with the Rossi X-ray Timing Explorer. The burst commenced with a brief (40ms) precursor and maintained near-Eddington fluxes during the initial 77s. These characteristics are indicative of a nova-like expulsion of a shell from the neutron star surface. Starting 122s into the burst, the burst shows strong (87±1% peak-to-peak amplitude) achromatic fluctuations for 60s. We speculate that the fluctuations are caused by Thompson scattering by fully-ionized inhomogeneities in a resettling accretion disk that was disrupted by the effects of super-Eddington fluxes. An expanding shell may be the necessary prerequisite for the fluctuations.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - X-rays: bursts - X-rays: individual: 2S 0918-549

Simbad objects: 8

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