X-ray bursts at extreme mass accretion rates

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Scientific paper

We show results of an XTE campaign and public data on one of the brightest persistent low-mass X-ray binaries, GX 17+2. X-ray bursts are seen which display a diversity in their properties. They are either short ( ~10 sec) or long (>min), and sometimes show (for the first time) evidence for radius expansion. One of the longest bursts ( ~30 min!) seen from this source shows evidence for a rather long hydrogen burning phase which is ignited by a short helium burst. We compare the X-ray burst properties to bursts seen in other sources with high inferred mass accretion, such as Cyg X-2 and GX 3+1. We also discuss their properties in the framework of standard X-ray burst theory, which in principle predicts NO X-ray bursts at such extreme high accretion rates.

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