Journal
ASTRONOMY & ASTROPHYSICS
Volume 409, Issue 2, Pages 659-663Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20031042
Keywords
accretion, accretion disks; globular clusters : individual : Terzan 6; X-rays : binaries; X-rays : bursts; X-rays : individuals : GRS 1747-312
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We report the serendipitous detection with the Rossi X-ray Timing Explorer of a long and peculiar X-ray burst whose position is consistent with one known X-ray burster (GRS 1747-312) and which occurred when that source was otherwise quiescent. The peculiar feature concerns a strong radius expansion of the neutron star photosphere, which occurred not within a few seconds from the start of the burst, as is standard in radius-expansion bursts, but 20 s later. This suggests that two different layers of the neutron star may have undergone thermonuclear runaways: a hydrogen-rich and a hydrogen-poor layer. The reason for the delay may be related to the source being otherwise quiescent.
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