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A superburst from 4U 1254-690

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arxiv astro-ph/0310364 v1 pith:DBQGBRZ6 submitted 2003-10-14 astro-ph

A superburst from 4U 1254-690

J.J.M. in 't Zand (SRON & Utrecht University) , E. Kuulkers (ESA-ESTEC) , F. Verbunt (Utrecht University) , J. Heise (SRON & Utrecht University) , R. Cornelisse (Univ. Southampton) This is my paper
classification astro-ph
keywords superburstx-raysuperburstsbrightbursterluminositypersistentlytype-i
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We report the detection with the BeppoSAX Wide Field Cameras of a superburst from 4U 1254-690. The superburst is preceded by a normal type-I X-ray burst, has a decay time that is the longest of all eight superbursts detected so far and a peak luminosity that is the lowest. Like for the other seven superbursts, the origin is a well-known type-I X-ray burster with a persistent luminosity level close to one tenth of the Eddington limit. Based on WFC data of all persistently bright X-ray bursters, the average rate of superbursts is 0.51+/-0.25 per year per persistently bright X-ray burster. Some systems may have higher superburst rates. For all superbursters, we present evidence for a pure helium layer which is burnt in an unstable as well as a stable manner.

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    XSPECT observations of two soft X-ray transients during outburst decay reveal superburst evolution with cooling blackbody emission and a flux-dependent hardening of Comptonized spectra.