Volume 409, Number 2, October II 2003
|Page(s)||659 - 663|
|Section||Stellar structure and evolution|
|Published online||17 November 2003|
A peculiar type-I X-ray burst from GRS 1747-312
SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
3 NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
4 Dept. of Astronomy, University of Maryland, College Park, MD 20742, USA
Corresponding author: J. J. M. in 't Zand, email@example.com
Accepted: 3 July 2003
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.
Key words: accretion, accretion disks / globular clusters: individual: Terzan 6 / X-rays: binaries / X-rays: bursts / X-rays: individuals: GRS 1747-312
© ESO, 2003
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